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Table 6 Parameter estimates for triplet BW and causal agents influencing BW, based on model 5d

From: Birth weight in a large series of triplets

  Mean/variance/covariance (grams)
  MZ DZ/TZ (fb, sb, tb)
Mean 2765 2915/2826, 2811, 2710
Variance 111 104
covariance 46 33
correlation 0.42 (0.29 - 0.54) 0.32 (0.25 - 0.38)
covariate range Effect in grams
GA -16 to 0: weight gain per week 130
Sex 0/1: Boy/girl -110
Smoking 0/1: No/yes -104
  1. GA = gestational age, fb = first born, sb = second born, tb = third born. Results given for MZ triplets include triplets from both the MZ group and the DZ group.