Table 4.

Adjusted Analyses for Outcomes at 13.3 Years According to Birth Order Among Brazilian Adolescents in the 1993 Pelotas Birth Cohort^a

Variable	Unadjusted			Model 1b			Model 2c
	Firstborns		P Value	Firstborns		P Value	Firstborns		P Value
	Coefficient	95% CI		Coefficient	95% CI		Coefficient	95% CI
Height, cm	2.6	1.0, 4.2	<0.01	2.1	0.5, 3.8	0.01	0.4	−0.9, 1.7	0.57
BMI, kg/m2	−0.1	−0.8, 0.7	0.83	0.1	−0.7, 0.9	0.80	−0.2	−0.9, 0.5	0.67
Sum of skinfolds, mm	0.0	−2.6, 2.6	1.00	0.9	−1.8, 3.7	0.51	0.2	−2.7, 3.1	0.91
Accelerometry, 1,000 counts	−17.3	−48.8, 14.2	0.28	−22.6	−55.3, 10.2	0.18	−16.9d	−47.6, 13.8	0.28
Accelerometry, minutes/week MVPA	−30	−77, 17	0.21	−39	−88, 10	0.12	−38d	−85, 8	0.11
Systolic blood pressure, mm Hg	3.5	1.2, 5.7	<0.01	2.5	0.4, 4.7	0.02	2.0	−0.7, 4.7	0.14
Diastolic blood pressure, mm Hg	2.0	0.7, 3.4	<0.01	2.1	0.7, 3.6	0.01	1.5	−0.3, 3.2	0.10
Lean mass, kg	0.77	−0.71, 2.26	0.31	0.10	−1.43, 1.63	0.90	−0.66	−2.30, 0.97	0.43
Fat mass, kg	0.06	−1.53, 1.66	0.94	0.57	−1.07, 2.21	0.50	−0.10	−1.71, 1.50	0.90

Abbreviations: BMI, body mass index; CI, confidence interval; MVPA, moderate-to-vigorous physical activity.

^aReference group: nonfirstborn.

^bModel 1: adjusted for confounders (maternal age, maternal height, maternal BMI, smoking during pregnancy, family income, and sex).

^cModel 2: adjusted for model 1 variables plus z score of birth weight, conditional weight and length at 48 months, and physical activity (counts) at 13.3 years.

^d Not adjusted for physical activity (counts) at 13.3 years.