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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: Psychol Trauma. 2017 May;9(3):292–300. doi: 10.1037/tra0000234

Table 2.

Infant Anthropometry at Birth and at 6 Months of Age

Variable1 Total – n (%) Mbekweni – n (%) TC Newman – n (%) P-value
Number of infants; sets of twins 112 57 (51); 1 55 (49); 0
Gender, female 58 (52) 34 (60) 24 (44) 0.090
Median gestational age at delivery (IQR) 39 (38 to 40) 39 (38 to 40) 39 (38 to 40) 0.943
Preterm birth 16 (14) 7 (12) 9 (16) 0.537
Infant anthropometry at birth
Median weight in kg (IQR) 3.0 (2.7 to 3.4) 3.1 (2.8 to 3.3) 3.0 (2.6 to 3.5) 0.463
Median WAZ (IQR) −0.7 (−1.4 to 0.03) −0.7 (−1.3 to 0.1) −0.9 (−1.5 to −0.01) 0.270
Low WAZ (WAZ of −2 or below) 9 (8) 3 (5) 6 (11) 0.317
Median head circumference in cm (IQR) 34 (32 to 34) 33 (32 to 34) 34 (32 to 34) 0.894
Median HCAZ (IQR) −0.6 (−1.5 to 0.1) −0.6 (−1.4 to 0.1) −0.6 (−1.6 to 0.2) 0.907
Low HCAZ (HCAZ of −2 or below) 17 (15) 7 (12) 10 (18) 0.384
Infant anthropometry at 6 months of age
Median age in months at study visit (IQR), corrected for prematurity at birth 5.9 (5.8 to 6.0) 5.9 (5.9 to 6.0) 5.9 (5.8 to 6.0) 0.773
Median weight in kg (IQR) 7.8 (6.7 to 8.6) 8.1 (7.1 to 8.8) 7.4 (6.5 to 8.5) 0.051
Median WAZ (IQR) 0.2 (−0.8 to 1.0) 0.4 (−0.4 to 1.4) −0.1 (−1.0 to 0.8) 0.011
Low WAZ (WAZ of −2 or below) 8 (7) 1 (2) 7 (13) 0.030
Median change in WAZ between birth and 6 months (IQR) 0.8 (−0.2 to 1.5) 1.0 (−0.02 to 1.9) 0.6 (−0.4 to 1.2) 0.076
Median head circumference in cm (IQR) 43 (42 to 44.3) 43 (42 to 44.5) 43 (42 to 44) 0.815
Median HCAZ (IQR) 0.2 (−0.6 to 1.4) 0.2 (−0.6 to 1.8) −0.01 (−0.7 to 1.3) 0.400
Low HCAZ (HCAZ of −2 or below) 2 (2) 2 (4) 0 (0) 0.496
Median change in HCAZ between birth and 6 months (IQR) 1.1 (−0.1 to 2.1) 1.3 (−0.04 to 2.5) 1.0 (−0.1 to 1.8) 0.375
1

WAZ = Weight-for-age z score; HCAZ = Head circumference-for-age z score