Breastfeeding and complementary feeding associated with body composition in 18–19 years old adolescents in the 1993 Pelotas Birth Cohort

Table 1 Comparison between adolescents who were followed-up at 18-y with the original cohort and the sub-sample at 6 and 12-months according to sociodemographic and anthropometric variables. 1993 Pelotas Birth Cohort

Variable	N original cohort	Cohort members followed in 2011–2012		Sub-sample cohort members (n = 1438) followed at 6 and 12 months and located in 2011–2012
Variable	N original cohort	% lost to follow-up^a	p ^b	% lost to follow-up^c	p ^d
All sample	5248	21.8		21.0
Sex
Men	2603	22.6	0.149	20.4	0.627
Women	2645	20.9		21.6
Maternal age (years)
< 20	915	23.3	0.420	27.3	0.068
20–34	3756	21.6		19.7
> 35	577	20.6		21.2
Maternal skin colour ^e
White	4058	22.2	0.313	21.9	0.246
Black	955	20.1		18.8
Others	234	20.5		14.2
Family income at birth (quintiles) ^e
1°	1031	24.4	0.06	24.5	0.502
2°	1195	21.1		21.1
3°	889	21.0		19.5
4°	1001	18.9		17.9
5°	1021	21.9		20.3
Maternal education (years) ^e
0–4	1427	25.5	<0.001	23.4	0.572
5–8	2424	19.1		19.8
9–11	923	20.8		19.9
> =12	427	26.2		22.9
Birth weight (grams) ^e
< 2500	510	27.6	0.001	21.2	0.285
≥ 2500	4722	21.0		18.7

^aNumber of lost to follow-up in 2012 as a percentage of those evaluated in the original cohort. ^bChi-squared test of the comparison between the cohort members followed-up in 2012 and the original cohort. ^cNumber of lost to follow-up in 2012 at 6 and 12 months with complete data at 2011–2012 follow-up as a percentage of those evaluated in the sub-sample at 6 and 12 months. ^dChi-squared test of the comparison between the cohort members with complete information for analyses at 18 years in relation with the sub-sample followed-up at 6 and 12 months. ^eVariables with missing data (maximum valor of missing information is 2% for family income)

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