Table 2. Selected characteristics of Child Health and Development Studies mothers and fathers at pregnancy enrollment (1959–1967) and of adult sons at follow-up (Study of the Environment and Reproduction, 2005).
| Mothers, 1959–1967 | Fathers,1959–1967 | Sons, 2005 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| Percentile | Percentile | Percentile | |||||||||||||
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| n | Mean (S.D.) | 25th | 50th | 75th | n | Mean (S.D.) | 25th | 50th | 75th | n | Mean (S.D.) | 25th | 50th | 75th | |
| Age (years) | 196 | 28.5 (5.9) | 24.0 | 29.0 | 33.0 | 196 | 31.4 (7.2) | 26.0 | 30.5 | 36.0 | 196 | 43.8 (1.7) | 43.0 | 44.0 | 45.0 |
| Birth year | 196 | 1962 (1.7) | 1961 | 1962 | 1963 | ||||||||||
| Coffee consumption (cups per day) | 161 | 2.3 (2.3) | 0.3 | 2.0 | 4.0 | 139 | 2.6 (2.2) | 0.5 | 2.0 | 4.0 | 188 | 1.5 (2.4) | 0.0 | 0.8 | 2.0 |
| Alcohol consumption (drinks per week) | 161 | 2.3 (3.1) | 0.8 | 1.0 | 1.8 | 138 | 4.6 (4.6) | 1.0 | 2.5 | 8.0 | 193 | 6.1 (9.7) | 0.0 | 2.2 | 8.0 |
| Cigarettes per day (for current smokers) | 47 | 15.5 (9.7) | 10.0 | 15.0 | 20.0 | 88 | 15.9 (9.5) | 5.0 | 20.0 | 20.0 | 32 | 12.2 (9.3) | 5.0 | 10.0 | 20.0 |
| n (%) | n (%) | n (%) | |||||||||||||
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| Race/ethnicity | |||||||||||||||
| Caucasian | 122 (62) | 115 (62) | 113 (58) | ||||||||||||
| African American | 45 (23) | 41 (22) | 48 (24) | ||||||||||||
| Hispanic | 8 (4) | 9 (5) | 16 (8) | ||||||||||||
| Asian | 17 (9) | 14 (8) | 18 (9) | ||||||||||||
| Other | 4 (2) | 7 (4) | 1 (1) | ||||||||||||
| Cigarette smoking | |||||||||||||||
| Current (yes/no) | 47 (24) | 92 (54) | 33 (18) | ||||||||||||
| Past (yes/no) | 47 (24) | 24 (14) | 33 (18) | ||||||||||||
| Non-smoker | 98 (51) | 53 (31) | 122 (65) | ||||||||||||
S.D. = standard deviation.