From: Bayesian frailty modeling of correlated survival data with application to under-five mortality
 | Burkina Faso | Benin | Cote D’lvoire | Ghana | Gambia | Guinea | Liberia |
Characteristics | HR [95% CI] | HR [95% CI] | HR [95% CI] | HR [95% CI] | HR [95% CI] | HR [95% CI] | HR [95% CI] |
Mothers’ characteristics | |||||||
 Mother’s current age | |||||||
  15–19 | 1.82 [1.28–2.23]* | 1.08 [0.86–1.33] | 1.23 [1.07–1.41]* | 0.99 [0.70–1.29] | 4.51 [3.28–6.03]* | 1.78 [1.29–2.4]* | 1.24 [0.94–1.59] |
  20–24 | 1.00 [0.77–1.28] | 1.86 [1.57–2.18]* | 0.6 [0.51–0.69]* | 1.18 [0.90–1.5] | 1.44 [1.11–1.79]* | 1.12 [1.02–1.26]* | 0.99 [0.77–1.25] |
  25–29 | 1.20 [0.94–1.50] | 1.23 [1.06–1.42]* | 0.74 [0.65–0.84]* | 1.30 [0.96–1.72] | 1.52 [1.22–1.84]* | 1.26 [1.11–1.44]* | 0.90 [0.78–1.03] |
  30–34 | 0.98 [0.76–1.17] | 1.47 [1.21–1.75]* | 0.85 [0.70–1.01] | 1.72 [1.44–2.01]* | 0.81 [0.58–1.07] | 0.63 [0.55–0.73]* | 0.94 [0.83–1.05] |
  35–39 | 1.07 [0.80–1.34] | 1.01 [0.84–1.22] | 1.49 [1.28–1.73]* | 0.80 [0.53–1.14] | 0.81 [0.64–1.03] | 0.57 [0.46–0.70]* | 0.56 [0.44–0.69]* |
  40–44 | 0.88 [0.70–1.09] | 1.63 [1.34–1.97]* | 0.93 [0.71–1.18] | 0.88 [0.58–1.28] | 2.20 [1.66–2.84]* | 0.72 [0.65–0.79]* | 0.60 [0.53–0.68]* |
  45–49 | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
 Mother’s age at first birth | |||||||
   < 15 years | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  15–19 years | 1.00 [0.74–1.43] | 1.52 [1.37–1.69]* | 1.04 [0.88–1.21] | 1.19 [0.92–1.57] | 0.32 [0.27–0.37]* | 1.02 [0.86–1.20] | 1.18 [0.99–1.37] |
  20–24 years | 1.00 [0.76–1.27] | 1.70 [1.41–2.03]* | 0.89 [0.75–1.04] | 1.47 [1.23–1.76]* | 0.19 [0.14–0.27]* | 1.50 [1.26–1.78]* | 1.3 [1.08–1.54]* |
  25–29 years | 1.06 [0.71–1.71] | 1.31 [1.13–1.51]* | 0.51 [0.44–0.59]* | 1.52 [1.10–2.00]* | 0.36 [0.26–0.49]* | 1.79 [1.37–2.23]* | 0.93 [0.76–1.14] |
  30–34 years | 0.68 [0.20–1.49] | 0.33 [0.26–0.41]* | 1.11 [0.85–1.41] | 1.45 [1.12–1.84]* | 0.62 [0.47–0.82]* | 0.42 [0.36–0.50]* | 1.00 [0.79–1.25] |
   > 34 years | 1.15 [0.55–2.44] | 0.78 [0.65–0.92]* | 1.53 [1.25–1.84]* | 1.64 [1.13–2.32]* | 1.33 [0.97–1.81] | 0.53 [0.44–0.62]* | 0.45 [0.35–0.58]* |
 Highest level of education | |||||||
  No education | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Primary | 0.81 [0.71–0.92] | 0.85 [0.73–0.97]* | 1.18 [1.01–1.37]* | 0.91 [0.73–1.13] | 1.26 [0.86–1.76] | 1.02 [0.88–1.17] | 0.77 [0.63–0.94]* |
  Secondary | 0.84 [0.76–0.92] | 0.86 [0.72–1.01] | 0.64 [0.46–0.86]* | 0.66 [0.51–0.84]* | 1.07 [0.701–1.51] | 0.67 [0.56–0.80]* | 0.80 [0.67–0.96]* |
  Tertiary | 1.64 [1.33–2.03] * | 0.89 [0.72–1.07] | 0.52 [0.37–0.72]* | 1.43 [0.89–2.13] | 2.40 [1.27–4.18]* | 0.90 [0.71–1.15] | 1.16 [0.79–1.68] |
 Current employment status | |||||||
  Currently employed | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Currently unemployed | 1.22 [1.02–1.43]* | 1.21 [1.03–1.39]* | 0.93 [0.82–1.06] | 0.96 [0.76–1.21] | 0.78 [0.63–0.97]* | 0.59 [0.52–0.67]* | 1.11 [1.04–1.18]* |
 Marital status | |||||||
  Not currently married | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Currently married/union | 0.65 [0.48–0.84]* | 0.65 [0.56–0.75]* | 0.99 [0.86–1.14] | 0.52 [0.35–0.71]* | 0.63 [0.43–0.93]* | 0.49 [0.4–0.61]* | 0.62 [0.53–0.71]* |
 Residence | |||||||
  urban | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Rural | 1.3 [1.06–1.61]* | 1.82 [1.57–2.09]* | 1.44 [1.21–1.68]* | 1.05 [0.84–1.32] | 0.16 [0.12–0.2]* | 0.62 [0.51–0.73]* | 0.96 [0.78–1.18] |
 Wealth | |||||||
  Poorest | 1.53 [1.23–1.8]* | 0.91 [0.79–1.08] | 1.17 [0.96–1.4] | 0.86 [0.64–1.12] | 0.99 [0.73–1.29] | 1.09 [0.97–1.23] | 1.08 [0.94–1.24] |
  Poorer | 1.62 [1.35–1.99]* | 0.83 [0.73–0.94]* | 0.77 [0.66–0.89]* | 0.99 [0.72–1.3] | 0.54 [0.36–0.74]* | 1.16 [1.01–1.32]* | 1.3 [1.14–1.49]* |
  Middle | 1.38 [1.12–1.71]* | 0.97 [0.84–1.08] | 1.04 [0.87–1.24] | 1.23 [0.95–1.58] | 0.79 [0.53–1.11] | 1.18 [1.00–1.37] | 1.49 [1.25–1.72]* |
  Richer | 1.38 [1.14–1.71]* | 0.69 [0.6–0.78]* | 1.14 [0.97–1.32] | 1.32 [1.08–1.6]* | 0.51 [0.39–0.65]* | 0.45 [0.37–0.52]* | 1.05 [0.90–1.22] |
  Richest | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
 Religion | |||||||
  Christian | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Muslim | 1.12 [0.96–1.29] | 0.78 [0.68–0.90]* | 1.19 [1.02–1.38]* | 1.45 [1.10–1.87]* | 0.13 [0.11–0.17]* | 1.01 [0.87–1.18] | 1.71 [1.39–2.09]* |
  No religion | 1.17 [0.56–1.90] | 0.58 [0.52–0.65]* | 0.96 [0.79–1.14] | 1.13 [0.90–1.45] | 1.84 [1.49–2.3]* | 2.50 [1.90–3.19]* | 0.99 [0.78–1.23] |
  Other religion | 0.48 [0.19–1.04] | 1.45 [1.17–1.79]* | 1.02 [0.9–1.15] | – | – | 5.76 [4.74–6.86]* | 1.05 [0.77–1.41] |
  Traditional | 1.49 [1.18–1.88]* | 1.18 [0.57–2.05] | – | 1.71 [1.15–2.51]* | – | – | 0.01 [0.00–0.02]* |
Child characteristics | |||||||
 Birth type | |||||||
  Singleton | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Multiple | 2.83 [2.41–3.19]* | 2.47 [2.09–2.87]* | 1.79 [1.45–2.19]* | 2.29 [1.68–3.07]* | 1.22 [0.89–1.59] | 1.89 [1.49–2.38]* | 2.23 [1.73–2.8]* |
 Sex | |||||||
  Female | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Male | 1.1 [0.95–1.24] | 1.36 [1.2–1.54]* | 1.18 [1.04–1.34]* | 1.2 [0.97–1.49] | 0.84 [0.63–1.09] | 1.22 [1.07–1.39]* | 1.16 [1.01–1.31]* |
 Child size at birth | |||||||
  Large | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Average | 1.26 [1.00–1.49] | 0.94 [0.81–1.08] | 1.10 [0.92–1.29] | 0.80 [0.67–0.94]* | 0.76 [0.58–0.96]* | 1.28 [1.06–1.5]* | 0.96 [0.79–1.16] |
  Small | 1.37 [0.98–1.71] | 1.66 [1.39–1.95]* | 0.98 [0.87–1.09] | 1.63 [1.33–1.96]* | 0.71 [0.57–0.87]* | 1.49 [1.23–1.79]* | 1.32 [1.09–1.57]* |
 Birth order | |||||||
  1st-3rd child | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  4th–6th child | 0.99 [0.75–1.22] | 1.39 [1.18–1.62]* | 0.76 [0.66–0.88]* | 1.30 [1.07–1.58]* | 0.86 [0.65–1.13] | 1.46 [1.3–1.64]* | 1.07 [0.9–1.28] |
  7th + child | 1.21 [0.86–1.66] | 2.41 [2.19–2.65]* | 0.51 [0.44–0.59]* | 1.85 [1.3–2.56]* | 0.68 [0.53–0.86]* | 1.41 [1.23–1.61]* | 0.93 [0.82–1.04] |
 Preceding birth interval | |||||||
   < 12 months | 1.46 [1.18–1.79]* | 0.94 [0.84–1.06] | 1.07 [0.89–1.26] | 0.98 [0.79–1.19] | 0.60 [0.49–0.73]* | 0.81 [0.74–0.89]* | 1.24 [1.1–1.41]* |
  11 to 23 months | 2.35 [1.95–2.83]* | 1.81 [1.5–2.16]* | 1.86 [1.62–2.12]* | 1.08 [0.89–1.33] | 1.56 [1.35–1.79]* | 1.29 [1.09–1.53]* | 1.73 [1.41–2.1]* |
  24 to 35 months | 1.81 [1.56–2.10]* | 1.12 [0.98–1.28] | 1.13 [1.01–1.27]* | 1.01 [0.74–1.34] | 0.65 [0.52–0.82]* | 1.26 [1.10–1.44]* | 1.3 [1.10–1.53]* |
   > 35 months | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
 Type of delivery | |||||||
  Skilled | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Unskilled | 1.20 [1.03–1.38]* | 0.88 [0.68–1.09] | 1.20 [1.05–1.39]* | 1.59 [1.29–1.9]* | 1.73 [1.26–2.32]* | 1.52 [1.33–1.71]* | 1.32 [1.18–1.46]* |
 Delivery mode | |||||||
  SVD | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |
  Caesarean | 0.68 [0.5–0.94]* | 0.96 [0.71–1.23] | 0.91 [0.71–1.13] | 1.49 [1.17–1.84]* | 1.66 [1.3–2.08]* | 1.96 [1.64–2.32]* | 0.77 [0.62–0.92]* |
 Country | |||||||
  Ghana | – | – | – | – | – | – | – |
  Burkina Faso | – | – | – | – | – | – | – |
  Benin | – | – | – | – | – | – | – |
  Cote D’Ivoire | – | – | – | – | – | – | – |
  Gambia | – | – | – | – | – | – | – |
  Guinea | – | – | – | – | – | – | – |
  Liberia | – | – | – | – | – | – | – |
  Mali | – | – | – | – | – | – | – |
  Nigeria | – | – | – | – | – | – | – |
  Niger | – | – | – | – | – | – | – |
  Serria Leone | – | – | – | – | – | – | – |
  Togo | – | – | – | – | – | – | – |
Gamma | −0.04 [−0.04–0.03]* | −0.05 [−0.06--0.04]* | −0.05 [−0.06--0.04]* | −0.05 [− 0.07--0.04]* | −0.07 [− 0.09--0.05]* | −0.04 [− 0.05--0.03]* | −0.05 [− 0.06--0.04]* |
ln (theta) | −7.75 [−47.5–1.65]* | −0.41 [− 0.96–0.04]* | −1.2 [−1.98--0.62]* | − 70.28 [− 223.76--0.54]* | 0.8 [0.13–1.4] | − 0.94 [− 1.65--0.39]* | −63.19 [− 209.6--1.23]* |
 | Mali | Nigeria | Niger | Serria Leone | Togo | Overall |  |
Characteristics | HR [95% CI] | HR [95% CI] | HR [95% CI] | HR [95% CI] | HR [95% CI] | HR [95% CI] | Â |
Mothers’ characteristics | |||||||
 Mother’s current age | |||||||
  15–19 | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
  20–24 | 1.23 [0.98–1.68] | 0.69 [0.65–0.75]* | 0.45 [0.37–0.54]* | 1.95 [1.58–2.4]* | 1.93 [1.29–2.74]* | 1.59 [1.54–1.64]* |  |
  25–29 | 1.25 [0.93–1.6] | 0.73 [0.67–0.8]* | 0.59 [0.52–0.67]* | 1.37 [1.15–1.59]* | 1.06 [0.85–1.31] | 1.43 [1.37–1.49]* |  |
  30–34 | 1.19 [0.94–1.51] | 0.67 [0.63–0.71]* | 0.50 [0.45–0.57]* | 1.14 [0.89–1.46] | 0.79 [0.66–0.93]* | 1.32 [1.27–1.4]* |  |
  35–39 | 1.2 0 [0.93–1.60] | 0.83 [0.76–0.90]* | 0.50 [0.43–0.58]* | 0.99 [0.80–1.20] | 0.84 [0.72–0.95]* | 1.11 [1.09–1.15]* |  |
  40–44 | 1.34 [0.92–1.84] | 1.14 [1.08–1.20]* | 0.63 [0.55–0.71]* | 1.40 [1.18–1.71]* | 0.79 [0.65–0.95]* | 1.09 [1.05–1.13]* |  |
  45–49 | 2.15 [1.7–2.63]* | 0.80 [0.72–0.88]* | 0.43 [0.36–0.51]* | 0.96 [0.76–1.20] | 1.02 [0.74–1.39] | 1.08 [1.02–1.18]* |  |
Mother’s age at first birth | |||||||
  < 15 years | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
 15–19 years | 0.91 [0.75–1.12] | 0.92 [0.88–0.96]* | 0.98 [0.84–1.14] | 0.93 [0.8–1.09] | 0.69 [0.54–0.87]* | 1.2 [1.18–1.22]* |  |
 20–24 years | 0.84 [0.68–1.03] | 0.90 [0.84–0.96]* | 0.89 [0.75–1.04] | 1.05 [0.88–1.24] | 0.73 [0.63–0.84]* | 1.15 [1.11–1.18]* |  |
  25–29 years | 0.84 [0.63–1.12] | 0.76 [0.71–0.81]* | 0.74 [0.64–0.84]* | 0.91 [0.75–1.1] | 0.47 [0.33–0.64]* | 1.28 [1.20–1.36]* |  |
  30–34 years | 1.17 [0.84–1.67] | 0.96 [0.91–1.02] | 1.06 [0.97–1.15] | 0.84 [0.69–1.01] | 0.76 [0.6–0.98]* | 1.62 [1.44–1.84]* |  |
   > 34 years | 1.68 [1.35–2.16]* | 0.99 [0.92–1.06] | 0.83 [0.72–0.95]* | 1.04 [0.86–1.22] | 2.48 [1.79–3.22]* | 2.52 [2.43–2.64]* |  |
Highest level of education | |||||||
 No education | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
 Primary | 1.21 [1.06–1.40]* | 0.97 [0.88–1.07] | 0.85 [0.71–1.12] | 1.22 [1.02–1.48]* | 1.13 [0.97–1.33] | 0.91 [0.89–0.94]* |  |
 Secondary | 0.96 [0.69–1.29] | 0.85 [0.75–0.95]* | 0.94 [0.71–1.20] | 1.35 [1.24–1.48]* | 0.75 [0.61–0.93] | 0.73 [0.69–0.76]* |  |
 Tertiary | 0.99 [0.84–1.16] | 0.84 [0.78–0.92]* | 0.53 [0.34–0.78]* | 0.61 [0.38–0.89]* | 0.98 [0.77–1.23] | 0.82 [0.78–0.86]* |  |
 Current employment status | |||||||
 Currently employed | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
 Currently unemployed | 0.74 [0.61–0.92]* | 0.94 [0.86–1.03] | 0.96 [0.82–1.11] | 0.59 [0.48–0.74]* | 1.16 [0.91–1.47] | 0.90 [0.84–0.95]* |  |
Marital status | |||||||
 Not currently married | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1. [reference] |  |
 Currently married/union | 0.47 [0.37–0.59]* | 0.94 [0.9–0.98]* | 0.3 [0.24–0.37]* | 0.68 [0.54–0.86]* | 1.46 [1.09–1.89]* |  |  |
Residence | |||||||
 Urban | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
 Rural | 1.77 [1.41–2.14]* | 1.34 [1.23–1.46]* | 5 [4.49–5.52]* | 1.2 [0.94–1.46] | 0.86 [0.71–1.03] | 1.45 [1.37–1.55]* |  |
Wealth | |||||||
 Poorest | 1.80 [1.44–2.25]* | 0.63 [0.6–0.66]* | 0.85 [0.73–0.98]* | 0.76 [0.61–0.94]* | 1.61 [1.47–1.77]* | 0.78 [0.74–0.82]* |  |
 Poorer | 1.21 [0.94–1.52] | 0.67 [0.64–0.71]* | 1.08 [0.93–1.25] | 0.97 [0.75–1.26] | 1.5 [1.27–1.74]* | 0.93 [0.91–0.96]* |  |
 Middle | 1.61 [1.37–1.88]* | 0.64 [0.59–0.7]* | 1.00 [0.83–1.20] | 0.94 [0.75–1.16] | 0.82 [0.67–0.99]* | 0.87 [0.82–0.92]* |  |
 Richer | 1.14 [0.96–1.39] | 0.67 [0.64–0.71]* | 1.02 [0.88–1.16] | 0.95 [0.76–1.15] | 0.81 [0.62–1.06] | 0.87 [0.83–0.90]* |  |
 Richest | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
Religion | |||||||
 Christian | 1.00 [reference] | 1.00 [reference] | – | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
 Muslim | 0.79 [0.55–1.08] | 0.88 [0.81–0.96]* | – | 0.97 [0.83–1.12] | 1.14 [0.94–1.32] | 1.25 [1.17–1.35]* |  |
 No religion | 1.28 [0.97–1.89] | – | – | 0.36 [0.25–0.52]* | 0.69 [0.59–0.79]* | 2.22 [2.08–2.37]* |  |
 Other religion | 0.94 [0.69–1.18] | 0.67 [0.63–0.72]* | – | 1.77 [1.3–2.28]* | 1.43 [1.09–1.87]* | 2.01 [1.68–2.45]* |  |
 Traditional | – | 0.43 [0.39–0.47]* | – | 0.04 [0.00–0.18]* | 1.07 [0.78–1.43] | 1.39 [1.26–1.54]* |  |
Child characteristics | |||||||
 Birth type | |||||||
  Singleton | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
  Multiple | 2.26 [1.80–2.83]* | 1.03 [0.96–1.10] | 2.93 [2.46–3.49]* | 0.93 [0.79–1.08] | 1.51 [1.15–1.93]* | 2.81 [2.60–3.02]* |  |
 Sex | |||||||
  Female | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
  Male | 1.25 [1.04–1.47]* | 1.1 [1.05–1.16]* | 0.88 [0.81–0.94]* | 1.12 [0.94–1.31] | 1.01 [0.85–1.19] | 1.14 [1.10–1.18]* |  |
 Child size at birth | |||||||
  Large | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
  Average | 1.11 [0.95–1.34] | 1.13 [1.06–1.21]* | 1.02 [0.91–1.15] | 0.99 [0.86–1.15] | 1.15 [0.94–1.37] | 1.12 [1.06–1.17]* |  |
  Small | 1.43 [1.14–1.79]* | 1.43 [1.35–1.52]* | 1.03 [0.9–1.17] | 1.53 [1.26–1.82]* | 1.6 [1.29–1.93]* | 1.48 [1.43–1.52]* |  |
 Birth order | |||||||
  1st-3rd child | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
  4th–6th child | 0.91 [0.78–1.05] | 0.82 [0.75–0.88]* | 0.96 [0.82–1.12] | 1.09 [0.85–1.35] | 1.12 [0.90–1.39] | 1.32 [1.28–1.36]* |  |
  7th + child | 1.12 [0.95–1.28] | 0.78 [0.73–0.83]* | 0.82 [0.7–0.95]* | 1.74 [1.44–2.08]* | 0.72 [0.58–0.89]* | 1.62 [1.52–1.70]* |  |
 Preceding birth interval | |||||||
   < 12 months | 2.42 [1.82–3.40]* | 1.21 [1.1–1.32]* | 1.24 [1.10–1.40]* | 1.37 [1.08–1.72]* | 0.78 [0.66–0.93]* | 1.58 [1.49–1.66]* |  |
  11 to 23 months | 2.64 [2.03–3.40]* | 1.88 [1.69–2.09]* | 1.15 [0.99–1.33] | 2.15 [1.69–2.66]* | 1.97 [1.59–2.43]* | 2.01 [1.90–2.11]* |  |
  24 to 35 months | 1.85 [1.45–2.31]* | 1.26 [1.15–1.38]* | 0.99 [0.84–1.15] | 1.40 [1.22–1.60]* | 1.65 [1.42–1.91]* | 1.39 [1.34–1.44]* |  |
   > 35 months | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
 Type of delivery | |||||||
  Skilled | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
  Unskilled | 0.84 [0.68–1.00] | 1.25 [1.15–1.36]* | 0.80 [0.71–0.90]* | 0.92 [0.78–1.08] | 1.24 [1.01–1.54]* | 1.15 [1.08–1.22]* |  |
 Delivery mode | |||||||
  SVD | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] | 1.00 [reference] |  |
  Caesarean | 1.24 [0.92–1.61] | 0.25 [0.22–0.28]* | 1.11 [0.91–1.34] | 0.68 [0.54–0.83]* | 0.76 [0.59–0.98]* | 1.04 [0.94–1.14] |  |
 Country | |||||||
  Ghana | – | – | – | – | – | 1.00 [reference] |  |
  Burkina Faso | – | – | – | – | – | 1.65 [1.56–1.74]* |  |
  Benin | – | – | – | – | – | 0.67 [0.64–0.7]* |  |
  Cote D’Ivoire | – | – | – | – | – | 0.75 [0.7–0.79]* |  |
  Gambia | – | – | – | – | – | 0.74 [0.67–0.8]* |  |
  Guinea | – | – | – | – | – | 0.84 [0.74–0.93]* |  |
  Liberia | – | – | – | – | – | 1.47 [1.36–1.58]* |  |
  Mali | – | – | – | – | – | 1.19 [1.06–1.33]* |  |
  Nigeria | – | – | – | – | – | 1.65 [1.54–1.77]* |  |
  Niger | – | – | – | – | – | 1.51 [1.38–1.64]* |  |
  Serria Leone | – | – | – | – | – | 1.86 [1.69–2.03]* |  |
  Togo | – | – | – | – | – | 0.92 [0.79–1.03] |  |
Gamma | −0.03 [−0.04--0.02]* | −0.04 [−0.04−−0.03]* | -0.03 [− 0.03--0.02]* | − 0.05 [− 0.06--0.04]* | −0.03 [− 0.04--0.02]* | −0.04 [− 0.04--0.03]* |  |
ln (theta) | −1.07 [−1.91--0.49]* | −1.47 [−1.85--1.16]* | −0.88 [− 1.34--0.5]* | −79.42 [− 220.4--3.38]* | −74.32 [−228.84--1.29]* | −1.17 [− 1.34--1]* |  |