Table 3.
Characteristics of Study Sample by Morningness/Eveningness
| Characteristic | Morning type (n=384) n (%)* | Evening type (n=256) n (%)* | p-Value |
|---|---|---|---|
| Age, mean (±SD) | 21.5 (±2.9) | 20.5 (±2.2) | <0.001 |
| Age (years) | |||
| 18 (n=498) | 57 (53.3) | 50 (46.7) | 0.005 |
| 19 (n=403) | 56 (47.9) | 61 (52.1) | |
| 20 (n=339) | 50 (61.0) | 32 (39.0) | |
| 21 (n=410) | 49 (70.0) | 21 (30.0) | |
| ≥22 (n=930) | 172 (65.2) | 92 (34.8) | |
| Sex | |||
| Female (n=1,002) | 260 (63.4) | 150 (36.6) | 0.019 |
| Male (n=1,579) | 124 (53.9) | 106 (46.1) | |
| Cigarette smoking status | |||
| Never (n=1,929) | 311 (63.5) | 179 (36.5) | 0.003 |
| Former (n=220) | 23 (54.8) | 19 (45.2) | |
| Current (n=432) | 50 (46.3) | 58 (53.7) | |
| Alcohol consumption | |||
| <1 drink/month (n=522) | 80 (62.9) | 47 (37.0) | <0.001 |
| 1–19 drinks/month (n=1,013) | 96 (42.7) | 129 (57.3) | |
| ≥20 drinks/month (n=1,046) | 208 (72.2) | 80 (27.7) | |
| BMI (kg/m2) | |||
| Underweight (<18.5) (n=84) | 15 (71.4) | 6 (28.6) | 0.122 |
| Normal (18.5–24.9) (n=1,299) | 216 (66.9) | 107 (33.1) | |
| Overweight (25.0–29.9) (n=481) | 88 (74.6) | 30 (25.4) | |
| Obese (≥30.0) (n=482) | 7 (46.7) | 8 (53.3) | |
| Any physical activity | |||
| No (n=907) | 111 (57.5) | 82 (42.5) | 0.422 |
| Yes (n=1,644) | 268 (60.9) | 172 (39.1) | |
*
Percentages displayed are row percent.