Table 3. Mean cognitive, language and motor scores according to socioeconomic, demographic, biological and nutritional variables.

Variables	n =135	Developmental scores
		Cognitive		Language		Motor
		Mean	P	Mean	P	Mean	P
Monthly family per capita income (Minimum Salaries)
? 0.25	41	109.1	0.22	108.1	0.32	109.1	0.43
0.26-0.50	65	111.9		109.1		106.3
> 0.50	29	111.2		111.5		107.3
Maternal schooling (years)
1-8	43	110.5	0.65	108.8	0.75	106.0	0.30
³ 9	92	111.1		109.4		108.0
Maternal age (years)
? 19	15	111.3	0.84	112.4	0.16	108.2	0.76
> 19	120	110.9		108.8		107.3
Number of people in household
? 3	48	110.7	0.84	110.0	0.43	105.2	0.07
³ 4	87	111.3		108.7		108.6
Children < 5 years
1	99	110.7	0.69	109.6	0.38	106.9	0.38
2-5	36	111.4		108.0		108.7
Sex
Male	71	108.9	0.002	106.7	0.001	105.1	0.007
Female	64	113.2		111.9		109.9
Birth weight (g)
? 1499	14	107.1	0.24	106.3	0.41	100.8	0.04
1500-2499	28	112.1		109.4		109.1
2500-2999	20	110.0		107.2		105.0
³ 3000	73	111.4		110.1		108.7
Size for gestational age
Small	13	111.2	0.62	110.6	0.05	108.0	0.18
Appropriate	99	110.6		108.0		106.5
Large	23	112.4		113.3		110.9
Apgar score at 5 minutes*
4-7	8	108.7	0.47	106.6	0.39	97.5	0.003
8-10	121	110.9		109.6		108.3
Duration of exclusive breastfeeding (months)†
? 2	20	108.7	0.18	105.2	0.02	102.8	0.02
³ 3	105	111.4		110.2		108.8
Weight-for-age (Z-score)‡
< -1	17	108.5	0.14	105.9	0.11	103.0	0.05
³ -1	116	111.5		109.8		108.2
Length-for-age (Z-score)§
< -1	32	110.9	0.84	107.0	0.13	104.3	0.03
³ -1	99	111.3		109.9		108.8
Head circumference-for-age (Z-score)§
< -1	12	110.0	0.59	104.4	0.07	101.1	0.02
³ -1	119	111.3		109.7		108.2

Missing cases: ^*6; ^†10; ^‡2 and ^§4 infants were not exclusively breasdtfed.