Table 1.
Description of the Sample in Terms of Birth Order, Sex, Growth Patterns in Early Life, Maternal Age, and Family Income Among Brazilian Firstborn and Later-born Adolescents in the 1993 Pelotas Birth Cohort
| Variable | Study Subset |
Full Cohort |
P Value | ||||
| No. | % | Mean (SD) | No. | % | Mean (SD) | ||
| Categorical | |||||||
| Birth order | 0.10 | ||||||
| Firstborns | 143 | 31.6 | 1,843 | ||||
| Others | 310 | 68.4 | 3,406 | 64.9 | |||
| Sex | 0.24 | ||||||
| Male | 237 | 52.3 | 2,606 | 49.7 | |||
| Female | 216 | 47.7 | 2,642 | 50.3 | |||
| Total | 453 | 100.0 | 5,249 | 100.0 | 1.00 | ||
| Numerical | |||||||
| Maternal age, years | 26.3 (6.2) | 26.0 (6.4) | 0.32 | ||||
| Family income (minimum wages)a | 3.0 (4.0) | 4.3 (5.8) | 0.22 | ||||
| Birth weight z score | −0.18 (1.16) | −0.35 (1.28) | 0.01 | ||||
| Birth length z score | −0.36 (1.22) | −0.53 (1.35) | 0.01 | ||||
Abbreviation: SD, standard deviation.
a
1.0 Brazilian real = 0.63000 US dollar.