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Table 3 Estimated coefficients (EST) and standard errors (SE) for the predictors selected in the different analyses

From: Model development including interactions with multiple imputed data

Predictor Reference Category CC (N = 216) MVNI (N = 382) FCS1 (N = 382) FCS2 (N = 382)
  Category   EST SE EST SE EST SE EST SE
Gender Female Male -0.441 0.674 0.129 0.398 0.030 0.391 0.017 0.390
Neonatal care No Yes 2.484* 0.723 1.103* 0.444 1.112* 0.450 1.085* 0.446
Fear No Yes -1.169 0.649 -0.958* 0.431 -1.009* 0.451 -1.073* 0.444
Smoked while pregnant No Yes 4.256* 1.237 1.019 0.736 0.885 0.693 0  
Smokers in home No Yes 0.939 0.537 0.742* 0.352 0.761* 0.341 0.801* 0.335
Smoke in vehicles No Yes -2.584* 0.921 -0.253 1.068 -0.308 1.011 -0.323 1.015
Exercise >4 times a week Up to once a week 2.805* 1.227 0.892 0.761 0.692 0.756 0.624 0.731
   2 – 4 times a week 3.313* 1.229 1.039 0.717 0.936 0.718 0.738 0.680
TV watching >3 hours a day Up to 1 hour a day -0.566 0.854 0.399 0.684 0.327 0.669 0.346 0.657
   1 – 3 hours a day 0.304 0.769 0.641 0.639 0.525 0.630 0.569 0.618
Number people in home 8+ 1 - 4 0   1.084 0.554 1.060* 0.539 1.101* 0.526
   5 - 7 0   0.226 0.552 0.254 0.551 0.250 0.540
Income R100001+ up to R1000 2.840* 1.257 0.695 0.8 0.787 0.789 0.823 0.778
   R1001 – R4500 1.285 1.203 0.209 0.797 0.489 0.754 0.431 0.754
   R4501 – R10000 1.933 1.17 1.428 0.783 1.401* 0.692 1.356 0.692
Food availability Enough Not always enough -0.575 0.64 0.604 0.503 0.665 0.464 0.677 0.455
Perceived weight Correct weight Overweight -0.230 0.743 0   0   0  
   Underweight 2.369* 0.97 0   0   0  
Work’nWear No Yes 0   -0.635 0.626 -0.543 0.629 -0.478 0.622
Pets ever No Yes -3.770* 0.994 1.658* 0.501 -1.483* 0.503 -1.413* 0.467
Area North Durban South Durban 6.278* 1.461 2.042* 0.76 1.948* 0.737 1.597* 0.671
Breakfast habits Daily Not daily -4.098 3.04 -0.492 1.512 -0.234 1.548 -0.110 1.518
Violence No Yes 0   -0.817* 0.382 -0.741* 0.377 -0.715 0.373
Weapons No Yes -1.147* 0.555 0   0   0  
Age    -1.068* 0.438 -0.79* 0.254 -0.833* 0.268 -0.834* 0.265
Predictor Reference Category CC (N = 216) MVNI (N = 382) FCS1 (N = 382) FCS2 (N = 382)
Category EST SE EST SE EST SE EST SE
Fear*Breakfast No/daily Yes/not daily 2.635* 1.219 2.047* 0.866 2.123* 0.916 2.185* 0.911
Gender*SmokeVehicle Female/No Male/yes 5.092* 1.342 2.535* 1.034 2.431* 0.977 2.464* 0.971
SmokeVehicle*TV No/>3 hrs Yes/up to 1 hr 0   0.891 1.298 0.675 1.265 0.722 1.250
   Yes/1 – 3 hrs 0   -2.184* 1.085 -1.975 1.034 -2.002 1.037
Food*Age enough/ Not always enough/ 1.762* 0.743 0.925* 0.396 0.786* 0.385 0.778* 0.364
Exercise*Area >4 times/ND < once a week/SD -4.573* 1.533 -1.41 1.031 -1.255 0.954 -1.125 0.923
   2 – 4 times/SD -6.331* 1.627 -1.981* 0.913 -1.805* 0.896 -1.551 0.850
Income*Breakfast > R10000/daily ≤R1000/not daily -4.051 2.5 -3.921* 1.8 -3.666* 1.731 -3.808* 1.733
   R1001-R4500/not daily 0.414 2.408 -1.218 1.636 -1.439 1.530 -1.513 1.516
   R4501-R10000/not daily 2.479 2.395 -1.374 1.541 -1.568 1.454 -1.715 1.431
TV*Breakfast >3 hrs/daily ≤1 hr/not daily 6.310* 2.213 2.573* 1.259 2.051 1.192 1.976 1.186
   1-3 hrs/not daily 1.974 2.154 0.192 1.109 0.270 1.112 0.192 1.103
SmokeVehicle*Age no/ yes/ 0   0.814* 0.375 0.809* 0.348 0.782* 0.341
Smoke preg*Area no/ND yes/SD -5.118* 2.101 -1.875 1.363 -1.663 1.291 0  
Work’nWear*Breakfast no/not daily yes/daily 0   2.349* 1.076 2.095 1.070 2.165* 1.090
  1. ND – North Durban; SD – South Durban; preg – pregnant.
  2. CC – Complete case.
  3. MVNI – Multiple imputed MVNI strategies 1 and 2.
  4. FCS1 -Multiple imputed FCS strategy 1.
  5. FCS2 -Multiple imputed FCS strategy 2.
  6. *Significant at the 0.05 level.