Table 3.
Outcomes at 13.3 Years According to Birth Order Among Brazilian Adolescents in the 1993 Pelotas Birth Cohort
| Variable | Mean (SD) |
P Value | |
| Firstborns (n = 143) | Others (n = 310) | ||
| Height, cm | 159.6 (7.8) | 157.0 (8.5) | 0.002a |
| BMI, kg/m2 | 20.3 (3.3) | 20.3 (4.0) | 0.834a |
| Sum of skinfolds, mm | 25.4 (12.0) | 25.4 (13.7) | 0.998a |
| Accelerometry, 1,000 counts | 384 (142) | 401 (149) | 0.274b |
| Accelerometry, minutes/week MVPA | 485 (218) | 515 (218) | 0.132b |
| Systolic blood pressure, mm Hg | 113.4 (13.9) | 109.8 (14.0) | 0.011a |
| Diastolic blood pressure, mm Hg | 70.7 (12.0) | 67.7 (10.8) | 0.009a |
| Lean mass, kg | 39.3 (7.4) | 38.6 (7.0) | 0.307a |
| Fat mass, kg | 11.9 (7.1) | 11.8 (7.9) | 0.937a |
| Lean mass index, kg/m2 | 15.4 (1.9) | 15.6 (1.9) | 0.452a |
| Fat mass index, kg/m2 | 4.7 (2.7) | 4.8 (3.0) | 0.792a |
Abbreviations: BMI, body mass index; MVPA, moderate-to-vigorous physical activity; SD, standard deviation.
a
t test.
b
Mann-Whitney test.