Table 1. Comparison between socioeconomic, demographic, anthropometric and reproductive characteristics of women that composed the final sample and losses of follow-up.

Rio de Janeiro, 2009–2012.

Variables	Final sample (n = 159)		Losses of follow-up (n = 75)a		p-valueb
	n	%	n	%
Age (years)
20–29	108	67.9	59	80.8	0.04
30–40	51	32.1	14	19.1
Early pregnancy BMI (kg/m2)
< 25	92	57.9	44	62.0	0.68
25–30	47	29.6	17	23.9
≥ 30	20	12.6	10	14.1
Education (years)
<11	98	61.6	43	61.4	0.98
≥11	61	38.4	27	38.6
Skin color
White	45	28.3	19	27.5	0.49
Brown	77	48.4	29	42.0
Black	37	23.3	21	30.4
Marital status
Lives with a partner	143	89.9	31	88.6	0.81
Does not lives with a partner	16	10.1	4	11.4
Parity (number of deliveries)
0	52	32.7	35	46.7	0.08
1	60	37.7	26	34.7
≥2	47	29.6	14	18.7

Note: BMI = Body Mass Index;

^a This n refers to total losses and is not the same for all variables, since some women left the study before we obtained this information.

^b p-value refers to chi-square test for proportions.