Table 1 Baseline characteristics of participants by total physical activity during adolescence, Nurses’ Health Study II, 1997
Characteristicsa | Total physical activity during adolescence (in MET-h/week) | ||||
|---|---|---|---|---|---|
< 21 (n = 5689) | 21 to < 36 (n = 6589) | 36 to < 48 (n = 4568) | 48 to < 72 (n = 6019) | 72+ (n = 5385) | |
Age at 1997 questionnaire return, yrs | 51.4 (4.8) | 51.0 (4.9) | 50.8 (5.0) | 50.7 (5.1) | 50.5 (5.1) |
Number of endoscopies during the study period (n) | 1.6 (0.8) | 1.6 (0.8) | 1.5 (0.8) | 1.5 (0.8) | 1.6 (0.8) |
Adult height (inches) | 64.8 (2.5) | 64.8 (2.6) | 65.0 (2.6) | 65.0 (2.6) | 65.1 (2.7) |
BMI at age 18 years (kg/m2) | 21.4 (3.5) | 21.2 (3.2) | 21.1 (3.1) | 21.0 (3.0) | 20.8 (2.8) |
Current BMI (kg/m2) | 25.7 (5.6) | 25.6 (5.4) | 25.7 (5.7) | 25.7 (5.4) | 26.0 (5.5) |
Waist circumference in 1993 (inches) | 30.9 (5.1) | 30.8 (5.1) | 30.7 (5.0) | 30.5 (4.8) | 30.7 (5.0) |
Hip circumference in 1993 (inches) | 39.4 (4.4) | 39.4 (4.4) | 39.3 (4.3) | 39.2 (4.3) | 39.3 (4.3) |
Waist/hip ratio | 0.78 (0.08) | 0.78 (0.08) | 0.78 (0.08) | 0.78 (0.08) | 0.78 (0.08) |
Body shapec (% of ≥ 5) | |||||
At 5 years of age | 8.6 | 7.1 | 6.3 | 6.6 | 5.0 |
At 10 years of age | 16.5 | 13.2 | 11.6 | 10.9 | 8.4 |
At 20 years of age | 14.3 | 10.8 | 9.6 | 8.4 | 6.8 |
Smoking | |||||
Before 20 years of age (%) | 24.4 | 22.7 | 22.9 | 21.7 | 23.5 |
Current smokers (%) | 5.9 | 6.7 | 7.3 | 8.3 | 10.0 |
Current alcohol intake (g/d) | 3.9 (6.3) | 4.2 (6.5) | 4.2 (6.4) | 4.1 (6.3) | 4.2 (6.5) |
Current physical activity (MET-h/week) | 17.2 (17.9) | 19.0 (18.1) | 20.6 (20.5) | 22.2 (20.4) | 26.0 (24.0) |
Time spent watching TV | |||||
During adolescence (hours/week) | 7.6 (6.3) | 7.5 (6.0) | 7.5 (5.8) | 7.7 (6.0) | 8.1 (6.2) |
Current (hours/week) | 8.9 (6.9) | 8.8 (6.4) | 8.8 (6.4) | 9.1 (6.6) | 9.3 (6.8) |
Premenopausal (%) | 52.5 | 52.9 | 52.2 | 52.5 | 52.1 |
Family history of CRC (%) | 27.7 | 27.4 | 25.6 | 26.3 | 27.9 |
Current aspirin use (≥ 2 times/week) | 8.8 | 8.7 | 9.8 | 9.2 | 9.4 |
Dietary intake during adolescence | |||||
Total energy intake (kcal/day) | 2609 (778) | 2692 (756) | 2739 (767) | 2797 (775) | 2934 (799) |
Unprocessed red meat (g/day) | 105.3 (49.2) | 107.7 (52.2) | 107.1 (51.2) | 108.3 (51.7) | 111.5 (52.7) |
Processed meat (g/day) | 23.5 (20.1) | 22.6 (18.3) | 22.7 (17.9) | 22.5 (18.1) | 23.9 (19.8) |
Total dairy (servings/day) | 2.6 (1.5) | 2.8 (1.4) | 2.8 (1.5) | 3.0 (1.5) | 3.1 (1.6) |
Total fibre (g/day) | 19.8 (4.9) | 20.5 (5.2) | 20.8 (5.1) | 21.2 (5.3) | 21.5 (5.5) |
Total calcium (mg/day) | 1057 (358) | 1078 (344) | 1088 (343) | 1097 (340) | 1091 (342) |
Total folate (μg/day) | 304 (88) | 317 (91) | 318 (90) | 326 (98) | 328 (96) |
Adult dietary intakeb | |||||
Total energy intake (kcal/day) | 1707 (474) | 1766 (470) | 1793 (479) | 1817 (489) | 1886 (508) |
Unprocessed red meat (g/day) | 51.8 (40.6) | 54.0 (39.3) | 55.3 (41.6) | 56.1 (42.5) | 61.0 (44.7) |
Processed meat (g/day) | 6.3 (10.0) | 6.2 (8.8) | 6.6 (9.7) | 6.5 (8.6) | 7.4 (10.1) |
Total fibre (g/day) | 18.8 (5.4) | 19.2 (5.5) | 19.2 (5.3) | 19.4 (5.3) | 19.2 (5.2) |
Total calcium (mg/day) | 1072 (433) | 1074 (415) | 1072 (423) | 1064 (420) | 1041 (404) |
Total folate (μg/day) | 473 (236) | 480 (230) | 478 (228) | 482 (235) | 474 (224) |
