Table 2.

Characteristics of children with neurodevelopmental assessments

	Probiotic group (n=337)	Placebo group (n=327)
Age at assessment, months corrected age, mean (SD)	30.7 (8.9) n=336	30.1 (7.8) n=325
Weight at assessment, kg mean (SD)	12.8 (2.6) n=328	12.7 (2.1) n=322
Height at assessment, cm mean (SD)	90.4 (7.6) n=320	89.9 (6.4) n=311
Head circumference at assessment, cm mean (SD)	48.8 (1.9) n=319	48.9 (2.0) n=312
Growth: z-scores, mean (SD)	n=329	n
Mean (SD)  Weight  Height  Head circumference	n=329 −0.6(1.3) −0.2(1.3) −1.2(1.3)	n=321 −0.6(1.3) −0.2(1.2) −1.1(1.4)
Sociodemographic variables
English only spoken at home, n (%)	231 (82.5) n=280	207 (77.2) n=268
Two caregivers (nuclear family structure), n (%)	236 (87.1) n=271	220 (87.0) n=253
Primary caregiver education, n (%)
<11 years of schooling   11–12 years of schooling   Tertiary	25 (9.3) 111 (41.1) 134 (49.6) n=270	31 (12.3) 94 (37.2) 128 (50.6) n=253
Primary caregiver employment, n (%)
Full time   Part time   Unemployed, pension	183 (67.5) 41 (15.1) 47 (17.3) n=271	144 (56.9) 60 (23.7) 49 (19.4) n=253
Primary income earner, n (%)
Skilled/professional   Semiskilled   Unskilled	141 (52.2) 85 (31.5) 44 (16.3) n=270	151 (59.7) 63 (24.9) 39 (15.4) n=253
Maternal age, n (%)
>21 years   18–21 years   <18 years	264 (97.4) 7 (2.6) 0 n=271	244 (96.4) 8 (3.2) 1 (0.4) n=253
SRI score, median (range)	2.0 (1.0–3.0) n=269	2.0 (1.0–4.0) n=252
Higher social risk (SRI≥2), n (%)	152 (56.5) n=269	152 (60.3) n=252

SRI, Social Risk Index.³⁸