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Table 4 Factors associated with time to start vaccinations (hazard ratios and 95 % confidence intervals from multivariable Cox proportional hazard regression with shared frailty)a

From: Improved coverage and timing of childhood vaccinations in two post-Soviet countries, Armenia and Kyrgyzstan

  Armenia, 2010 Kyrgyzstan, 2012
  DTP3 MCV DTP3 MCV
Gender HR (95 % CI) HR (95 % CI) HR (95 % CI) HR (95 % CI)
 Male vs. female 0.89 (0.78–1.02) 0.94 (0.82–1.08) 1.03 (0.95–1.10) 0.94 (0.87–1.02)
Childhood place of residence     
 Urban vs. rural 0.73 (0.57–0.92) 0.83 (0.67–1.03) 1.01 (0.82–1.25) 1.03 (0.85–1.23)
Birth order     
 1 vs. 3+ 0.63 (0.40–1.01) 0.97 (0.60–1.55) 1.01 (0.87–1.17) 1.02 (0.87–1.20)
 2 vs. 3+ 0.61 (0.39–0.96) 0.84 (0.52–1.34) 0.96 (0.84–1.11) 1.00 (0.86–1.15)
 3 vs. 3+ 0.55 (0.34–0.89) 0.80 (0.50–1.29) 1.04 (0.92–1.18) 1.10 (0.96–1.26)
Mother’s age     
 15–19 vs. 45–49 6.14 (1.76–21.42) 3.42 (0.89–13.17) 1.19 (0.69–2.04) 1.04 (0.51–2.09)
 20–24 vs. 45–49 5.39 (1.73–16.83) 2.51 (0.80–7.82) 0.95 (0.65–1.39) 1.10 (0.75–1.61)
 25–29 vs. 45–49 5.24 (1.70–16.19) 2.76 (0.90–8.54) 0.91 (0.63–1.31) 1.13 (0.78–1.62)
 30–34 vs. 45–49 4.77 (1.54–14.73) 2.47 (0.80–7.64) 0.89 (0.62–1.28) 1.12 (0.78–1.60)
 35–39 vs. 45–49 4.52 (1.44–14.17) 2.31 (0.74–7.23) 0.92 (0.64–1.33) 1.11 (0.77–1.59)
 40–44 vs. 45–49 4.93 (1.46–16.75) 2.26 (0.67–7.60) 1.00 (0.68–1.47) 1.23 (0.84–1.79)
Mother’s education     
 Secondary vs. higher 0.95 (0.82–1.10) 0.91 (0.78–1.07) 0.95 (0.88–1.03) 1.01 (0.92–1.10)
Wealth index     
 Poorest vs. richest 0.92 (0.65–1.30) 0.97 (0.69–1.35) 1.14 (0.89–1.46) 0.89 (0.69–1.13)
 Poor vs. richest 1.08 (0.81–1.45) 1.01 (0.76–1.34) 1.15 (0.90–1.47) 0.85 (0.66–1.09)
 Middle vs. richest 0.96 (0.73–1.26) 0.88 (0.68–1.14) 1.15 (0.90–1.47) 0.91 (0.71–1.16)
 Rich vs. richest 1.03 (0.80–1.33) 0.95 (0.74–1.21) 1.13 (0.92–1.40) 0.92 (0.75–1.14)
Region     
 Aragatsotn vs. Yerevan (capital) 1.00 (0.67–1.49) 0.98 (0.69–1.40) - -
 Ararat vs. Yerevan (capital) 0.84 (0.56–1.27) 0.85 (0.59–1.21) - -
 Armavir vs. Yerevan (capital) 0.60 (0.40–0.91) 0.71 (0.49–1.02) - -
 Gegharkunik vs. Yerevan (capital) 1.05 (0.72–1.54) 0.74 (0.53–1.04) - -
 Lori vs. Yerevan (capital) 0.81 (0.52–1.24) 0.89 (0.62–1.29) - -
 Kotayk vs. Yerevan (capital) 0.87 (0.60–1.28) 0.86 (0.62–1.20) - -
 Shirak vs. Yerevan (capital) 1.31 (0.90–1.91) 1.23 (0.89–1.72) - -
 Syunik vs. Yerevan (capital) 0.39 (0.26–0.60) 0.38 (0.26–0.55) - -
 VayotsDzor vs. Yerevan (capital) 0.77 (0.51–1.16) 0.77 (0.53–1.10) - -
 Tavush vs. Yerevan (capital) 0.86 (0.59–1.26) 0.72 (0.52–1.01) - -
  Issyk-Kul vs. Bishkek (capital) - - 2.93 (2.10–4.10) 1.34 (1.01–1.79)
  Djalal-Abad vs. Bishkek (capital) - - 4.03 (2.89–5.64) 1.76 (1.33–3.32)
  Naryn vs. Bishkek (capital) - - 1.96 (1.38–2.77) 1.21 (0.90–1.62)
  Batken vs. Bishkek (capital) - - 1.94 (1.39–2.71) 0.94 (0.70–1.25)
  Osh Oblast vs. Bishkek (capital) - - 1.59 (1.13–2.23) 1.24 (0.93–1.65)
  Talas vs. Bishkek (capital) - - 2.49 (1.78–3.50) 1.53 (1.15–2.04)
  Chui vs. Bishkek (capital) - - 2.55 (1.79–3.62) 1.10 (0.82–1.48)
  Osh City vs. Bishkek (capital) - - 2.73 (2.00–3.71) 1.57 (1.20–2.05)
  1. HR hazard ratio, CI confidence intervals
  2. aAdjusted for child’s year of birth and other variables listed in the table