Table 1.
Age-standardised characteristics in 1998 by quintiles of dairy intake during high school, NHS2.
| Dairy intake during high school | |||||
|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | Q5 | |
| Quintile range (servings/day) | ≤1.42 | 1.43–2.20 | 2.21–3.14 | 3.15–3.99 | ≥4.00 |
| N | 5425 | 5397 | 5525 | 5756 | 5094 |
| Age (years) | 43.4 (4.3) | 43.0 (4.2) | 43.2 (4.2) | 43.4 (4.1) | 42.9 (4.1) |
| Height (inches) | 64.6 (2.6) | 64.8 (2.6) | 64.9 (2.6) | 65.1 (2.5) | 65.3 (2.6) |
| BMI (kg/m2) | 26.0 (5.7) | 25.9 (5.9) | 25.8 (5.8) | 25.6 (5.6) | 25.5 (5.7) |
| BMI at age 18 years (kg/m2) | 21.2 (3.2) | 21.3 (3.3) | 21.2 (3.3) | 21.1 (3.1) | 21.0 (3.0) |
| Current smokers (%) | 8.4 | 9.5 | 7.9 | 7.1 | 6.5 |
| Packyears of smoking (among smokers) | 14.1 (11.4) | 14.2 (11.8) | 13.5 (11.1) | 12.7 (10.4) | 12.7 (10.8) |
| Packyears of smoking before age 20 years (among smokers) | 2.8 (2.2) | 2.8 (2.1) | 2.7 (2.1) | 2.8 (2.2) | 2.8 (2.1) |
| Physical activity (MET-hours/week) | 18.1 (23.2) | 18.7 (22.4) | 19.1 (24.2) | 18.8 (22.1) | 20.2 (22.9) |
| Physical activity during 9th–12th grade (MET-hours/week) | 46.8 (34.8) | 49.3 (35.1) | 50.9 (35.8) | 52.0 (35.6) | 56.6 (37.8) |
| Family history of colorectal cancer (%) | 7.7 | 8.0 | 8.7 | 8.0 | 8.1 |
| Diabetes (%) | 4.6 | 4.1 | 4.0 | 3.7 | 3.3 |
| Premenopausal (%) | 86.8 | 88.4 | 88.2 | 89.3 | 89.9 |
| Regular aspirin use (%) | 10.5 | 10.0 | 9.9 | 11.0 | 10.8 |
| Screening as indication for the current endoscopy (%) | 27.5 | 25.6 | 25.8 | 25.6 | 26.1 |
| Dietary intake during high school | |||||
| Total calcium intake during high school (mg/day) | 726 (171) | 887 (161) | 1111 (286) | 1289 (240) | 1413 (304) |
| Dairy calcium intake during high school (mg/day) | 413 (175) | 587 (167) | 827 (321) | 1010 (262) | 1124 (328) |
| Non-dairy calcium intake during high school (mg/day) | 313 (75) | 300 (62) | 283 (67) | 279 (61) | 290 (62) |
| Folate intake during high school (µg/day) | 307 (100) | 313 (95) | 317 (89) | 324 (91) | 333 (93) |
| Red (without processed) meat intake during high school (servings/day) | 0.9 (0.4) | 0.9 (0.4) | 0.9 (0.4) | 1.0 (0.4) | 1.0 (0.4) |
| Processed meat intake during high school (servings/day) | 0.5 (0.4) | 0.6 (0.4) | 0.6 (0.4) | 0.6 (0.4) | 0.7 (0.5) |
| Dietary intake during adulthood | |||||
| Total dairy (servings/day) | 1.6 (0.9) | 1.9 (0.9) | 2.1 (1.0) | 2.4 (1.1) | 2.7 (1.2) |
| Total calcium (mg/day) | 1356 (685) | 1372 (641) | 1431 (635) | 1495 (636) | 1525 (615) |
All values other than age have been directly standardised to age distribution (5-year age groups) of all participants who had an endoscopy between 1998 and 2011. Mean (SD) presented for continuous variables.
BMI body mass index, MET metabolic equivalent task.