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Table 5 Characteristics associated with delayed receipt of DTP at 2, 4 and 6 months of age

From: Immunisation timeliness in a cohort of urban Aboriginal and Torres Strait Islander children

Characteristic 2 months 4 months 6 months Any delayed
Delayed: n/N (%) OR (95% CI) p-value Delayed: n/N (%) OR (95% CI) p-value Delayed: n/N (%) OR (95% CI) p-value Delayed: n/N (%) OR (95% CI) p-value
Sex  
 Male 16/64 (25.0)    29/61 (47.5)    28/52 (53.8)    36/65 (55.4)   
 Female 11/62 (17.7) 0.65 (0.27–1.53) 0.32 19/59 (32.2) 0.52 (0.25–1.10) 0.09 22/53 (41.5) 0.61 (0.28–1.32) 0.21 25/61 (41.0) 0.56 (0.28–1.13) 0.12
Care type  
 Both parents 17/69 (24.6)    28/67 (41.8)    30/59 (50.8)    33/68 (48.5)   
 Single parent 9/48 (18.8) 0.71 (0.25–1.89) 0.60 19/44 (43.2) 1.06 (0.46–2.44) 1.00 18/38 (47.4) 0.87 (0.35–2.13) 0.90 27/50 (54.0) 1.24 (0.56–2.76) 0.69
 Othera 1/8 (12.5) 0.44 (0.01–3.85) 0.79 1/8 (12.5) 0.20 (0.00–1.72) 0.21 2/7 (28.6) 0.39 (0.03–2.63) 0.48 1/7 (14.3) 0.18 (0.00–1.61) 0.18
Primary Carer  
 Mother 25/103 (24.3)    42/98 (42.9)    42/86 (48.8)    52/104 (50.0)   
 Otherb 2/16 (12.5) 0.45 (0.05–2.17) 0.48 5/15 (33.3) 0.67 (0.21–2.10) 0.49 5/12 (41.7) 0.75 (0.22–2.54) 0.64 5/15 (33.3) 0.50 (0.16–1.56) 0.23
Child care  
 No 22/90 (24.4)    35/84 (41.7)    34/71 (47.9)    43/90 (47.8)   
 Yes 5/35 (14.3) 0.52 (0.18–1.49) 0.22 13/35 (37.1) 0.83 (0.37–1.86) 0.65 15/33 (45.5) 0.91 (0.40–2.08) 0.82 17/35 (48.6) 1.03 (0.47–2.25) 0.94
Education level of mother  
 Did not finish high school 10/51 (19.6)    19/49 (38.8)    23/45 (51.1)    27/51 (52.9)   
 High school 13/56 (23.2) 1.24 (0.44–3.53) 0.83 21/53 (39.6) 1.04 (0.47–2.30) 0.93 18/45 (40.0) 0.64 (0.28–1.47) 0.29 24/56 (42.9) 0.67 (0.31–1.43) 0.30
 Post-school qualificationc 3/15 (20.0) 1.02 (0.16–4.92) 1.00 6/14 (42.9) 1.18 (0.36–3.95) 0.78 6/12 (50.0) 0.96 (0.27–3.42) 0.95 7/15 (46.7) 0.78 (0.25–2.47) 0.67
Education level of father
 Did not finish high school 14/57 (24.6)    21/54 (38.9)    25/48 (52.1)    30/56 (53.6)   
 High school 8/31 (25.8) 1.07 (0.34–3.22) 1.00 14/30 (46.7) 1.37 (0.50–3.72) 0.64 12/26 (46.2) 0.79 (0.30–2.05) 0.63 15/31 (48.4) 0.81 (0.31–2.14) 0.81
 Post-school qualificationc 1/14 (7.14) 0.24 (0.01–1.89) 0.28 4/13 (30.8) 0.70 (0.14–2.93) 0.84 5/10 (50.0) 0.92 (0.24–3.59) 0.91 4/13 (30.8) 0.39 (0.08–1.60) 0.23
Employment status of mother
 Employedd 1/15 (6.7)    3/14 (21.4)    3/12 (25.0)    2/14 (14.3)   
 Unemployed 26/109 (23.9) 4.35 (0.60–192.46) 0.23 45/104 (43.3) 2.77 (0.68–16.40) 0.20 46/92 (50.0) 2.97 (0.68–18.14) 0.18 58/110 (52.7) 6.60 (1.37–63.51) 0.01
Employment status of father
 Employedd 11/53 (20.8)    19/49 (38.8)    19/43 (44.2)    22/52 (42.3) 1.74 (0.79–3.80) 0.17
 Unemployed 13/51 (25.5) 1.31 (0.52–3.26) 0.57 22/49 (44.9) 1.29 (0.58–2.88) 0.54 24/43 (55.8) 1.60 (0.68–3.74) 0.28 28/50 (56.0) 0.73 (0.42–1.27) 0.27
Number of other children in household
 0 3/26 (11.5)    5/23 (21.7)    5/19 (26.3)    5/24 (20.8)   
 1–2 17/68 (25.0) 2.53 (0.64–14.81) 0.25 30/66 (45.5) 3.00 (1.00–9.04) 0.05 31/59 (52.5) 3.10 (0.99–9.71) 0.05 37/68 (54.4) 4.54 (1.52–13.55) 0.01
 3+ 7/30 (23.3) 2.30 (0.45–15.49) 0.43 13/29 (44.8) 2.93 (0.85–10.02) 0.09 12/25 (48.0) 2.58 (0.71–9.37) 0.15 17/32 (53.1) 4.31 (1.29–14.37 0.02
Income level
  < $26,000 8/42 (19.0)    19/40 (47.5)    20/35 (37.7)    28/44 (63.6)   
 $26,000–≤ $52,000 15/49 (30.6) 1.86 (0.64–5.79) 0.31 20/47 (42.6) 0.82 (0.32–2.08) 0.81 18/40 (45.0) 0.62 (0.22–1.68) 0.41 22/49 (44.9) 0.47 (0.19–1.16) 0.11
 $52,000–≤ $78,000 3/21 (14.3) 0.71 (0.11–3.46) 0.93 6/19 (31.6) 0.52 (0.13–1.82) 0.38 8/18 (44.4) 0.61 (0.16–2.18 0.56 7/19 (36.8) 0.34 (0.09–1.16) 0.09
  > $78,000 1/9 (11.1) 0.54 (0.01–5.13) 0.99 2/9 (22.2) 0.32 (0.03–1.98) 0.31 2/7 (28.6) 0.31 (0.03–2.21) 0.33 2/9 (22.2) 0.17 (0.02–1.03) 0.06
Father’s age at birth of child
  < 20 years 2/7 (28.6)    3/7 (42.9)    4/7 (57.1)    5/7 (71.4)   
 20–29 years 16/76 (21.1) 0.67 (0.10–7.66) 0.95 28/71 (39.4) 0.87 (0.14–6.39) 1.00 32/64 (50.0) 0.75 (0.10–4.84) 1.00 37/76 (48.7) 0.38 (0.03–2.52) 0.45
  ≥ 30 years 8/38 (21.1) 0.67 (0.09–8.32) 0.99 16/37 (43.2) 1.01 (0.15–7.93) 1.00 12/29 (41.4) 0.54 (0.07–3.84) 0.74 17/38 (44.7) 0.33 (0.03–2.34) 0.38
Mother’s age at birth of child
  < 20 years 6/28 (21.4)    11/27 (40.7)    14/26 (53.8)    14/28 (50.0)   
 20–29 years 16/67 (23.9) 1.15 (0.36–4.08) 1.00 25/63 (39.7) 0.96 (0.35–2.69) 1.00 27/55 (49.1) 0.83 (0.29–2.33) 0.87 34/67 (50.7) 1.03 (0.43–2.49) 0.95
  ≥ 30 years 4/29 (13.8) 0.59 (0.11–2.88) 0.68 11/28 (39.3) 0.94 (0.28–3.17) 1.00 7/22 (31.8) 0.41 (0.10–1.51) 0.21 11/29 (37.9) 0.61 (0.21–1.75) 0.36
Gestational age
  ≥ 37 weeks gestation 26/108 (24.1)    44/103 (42.7)    44/91 (48.4)    55/108 (50.9)   
  < 37 weeks gestation 0/15 (0.0) 0.15 (0–0.96) 0.04 3/14 (21.4) 0.37 (0.06–1.51) 0.21 4/11 (36.4) 0.61 (0.12–2.61) 0.67 4/15 (26.7) 0.35 (0.08–1.29) 0.13
Birthweight
  ≥ 2500 grams 25/103 (24.3)    42/98 (42.9)    43/87 (49.4)    53/103 (51.5)   
  < 2500 grams 1/20 (5.0) 0.17 (0.00–1.15) 0.08 5/19 (26.3) 0.48 (0.12–1.55) 0.27 5/15 (33.3) 0.51 (0.13–1.82) 0.38 6/20 (30.0) 0.40 (0.14–1.13) 0.09
  1. aOther = shared, other relative, other non-family member;bOther = Father, Mother and Father, Grandparent, Grandparent and Father, Other non-family; cPost-school qualification = Certificate, Diploma, Bachelor Degree; dEmployed = Full Time, Part Time, Casual