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Table 2 Baseline characteristics of study participants presented with number (n) and percentages, determinants of untimely vaccination, and determinants of incomplete vaccination at end of follow-up presented with hazard ratios (HR) with 95% confidence interval assessed with a cluster adjusted Cox regression model.

From: Vaccination coverage and timeliness in three South African areas: a prospective study

  n (%)
765
HR for untimely
Unadjusted model
vaccination (95%CI)
Adjusted model
HR for incomplete
Unadjusted model
vaccination (95%CI)
Adjusted model
Mother's age      
   ≤ 19 265 (23) 1   1  
   20 - 24 387 (34) 0.77 (0.57-1.0)   0.70 (0.47-1.1)  
   25 - 29 249 (22) 0.91 (0.68-1.2)   0.59 (0.41-0.85)  
   ≥ 30 234 (21) 0.90 (0.65-1.2)   0.96 (0.66-1.4)  
Marital status   *   *  
   Married or cohabiting 712 (63) 1   1  
   Single, widowed, separated or divorced 422 (37) 0.64 (0.51-0.81)   0.65 (0.45-0.95)  
Gender of infant      
   Girl 568 (50) 1 1 1  
   Boy 559 (50) 1.3 (1.0-1.6) 1.2 (0.92-1.5) 0.95 (0.68-1.3)  
Mother's education     *  
   Primary (0-7 years) 142 (11) 1   1  
   Secondary (8-11 years) 756 (59) 1.2 (0.80-1.7)   0.62 (0.40-0.96)  
   Higher (12 or above) 378 (30) 0.81 (0.53-1.2)   0.31 (0.19-0.53)  
Socio economic wealth index   *   *  
   Least poor quintile 234 (21) 1   1  
   4th quintile 253 (22) 0.91 (0.56-1.5)   1.4 (0.70-3.0)  
   3rd quintile 223 (20) 1.1 (0.69-1.8)   2.2 (1.1-4.4)  
   2nd quintile 210 (18) 1.5 (1.0-2.4)   3.6 (1.8-7.0)  
   Poorest quintile 217 (19) 2.4 (1.6-3.6)   7.5 (4.0-14)  
Living area   * * * *
   Paarl 349 (31) 1 1 1 1
   Rietvlei 305 (27) 3.8 (2.7-5.5) 3.3 (2.3-4.7) 7.4 (4.4-13) 7.2 (4.7-11)
   Umlazi 480 (42) 1.7 (1.3-2.4) 1.6 (1.2-2.3) 1.9 (1.1-3.5) 2.2 (1.3-3.7)
Place of delivery   * * *  
   Home 68 (6) 1 1 1  
   In health facility 1021 (94) 0.37 (0.26-0.54) 0.53 (0.38-0.74) 0.36 (0.20-0.64)  
Health councelling     * *
   Normal 485 (43) 1   1 1
   Additional peer-counselling 535 (47) 0.88 (0.56-1.4)   0.67 (0.35-1.28) 0.64 (0.49-0.83)
   Intention to formula feed 117 (10) 0.74 (0.41-1.3)   0.40 (0.16-0.96) 0.39 (0.18-0.89)
Number of siblings     * *
   None 537 (47) 1   1 1
   1 - 2 464 (41) 1.0 (0.84-1.3)   1.3 (1.04-1.7) 1.3 (0.97-1.7)
   3 or above 130 (11) 1.4 (1.08-1.9)   2.2 (1.4-3.5) 1.7 (1.0-2.7)
Mother's body mass index (BMI)      
   < 20 70 (8) 1   1  
   20 - 24.9 361 (39) 1.3 (0.76-2.1)   0.82 (0.44-1.5)  
   25 - 29.9 283 (31) 1.2 (0.69-2.2)   0.77 (0.40-1.5)  
   ≥ 30 211 (23) 1.5 (0.88-2.5)   0.76 (0.43-1.3)  
  1. * Significantly associated variables (both categorised and socio-economy also uncategorised)
  2. Interactions were checked and none were considered meaningful to include
  3. All factors are cluster adjusted
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