Cardiorespiratory fitness* | ||||
---|---|---|---|---|
Low | Middle/high | |||
Cases | HR† (95% CI) | Cases | HR† (95% CI) | |
Car time‡ | ||||
Q1 | 67 | 0.63 (0.46 to 0.88) | 112 | 0.58 (0.42 to 0.80) |
Q2 | 62 | 0.61 (0.44 to 0.85) | 91 | 0.52 (0.38 to 0.72) |
Q3 | 49 | 0.71 (0.49 to 1.01) | 54 | 0.51 (0.35 to 0.73) |
Q4 | 84 | 1.0 | 62 | 0.60 (0.42 to 0.86) |
TV viewing‡ | ||||
Q1 | 39 | 0.93 (0.63 to 1.38) | 86 | 0.74 (0.53 to 1.04) |
Q2 | 66 | 0.93 (0.67 to 1.30) | 74 | 0.65 (0.46 to 0.92) |
Q3 | 81 | 0.97 (0.71 to 1.34) | 95 | 0.91 (0.66 to 1.27) |
Q4 | 76 | 1.0 | 64 | 0.68 (0.48 to 0.97) |
Total sedentary time‡ | ||||
Q1 | 48 | 0.71 (0.50 to 1.02) | 98 | 0.60 (0.44 to 0.82) |
Q2 | 47 | 0.63 (0.44 to 0.90) | 69 | 0.58 (0.41 to 0.81) |
Q3 | 80 | 0.80 (0.59 to 1.09) | 92 | 0.68 (0.49 to 0.93) |
Q4 | 87 | 1.0 | 60 | 0.60 (0.43 to 0.86) |
*Cardiorespiratory fitness was categorised into age (20–39, 40–49, 50–59, and ≥60 years) and gender-specific tertiles based on the distribution of the sample. Cardiorespiratory fitness was then dichotomised into low and middle/high for the joint effects analysis.
†Cox proportional hazard regression was utilised to estimate the HR and 95% CIs. The model was adjusted for age, gender, current smoking, alcohol, personal history of hypertension, personal history of diabetes, family history of CVD, physical activity, BMI, total cholesterol, systolic blood pressure and glucose.
‡Total sedentary time (ie, the sum of reported TV viewing and car time) was categorised into sample-specific quartiles (Q): Q1 (0–10 h/week), Q2 (11–15 h/week), Q3 (16–22 h/week) and Q4 (≥23 h/week). Quartiles of car time: (Q): Q1 (0–4 h/week), Q2 (5–7 h/week), Q3 (8–10 h/week) and Q4 (≥11 h/week). Quartiles of TV viewing: (Q): Q1 (0–3 h/week), Q2 (4–7 h/week), Q3 (8–12 h/week) and Q4 (≥13 h/week).
BMI, body mass index; CVD, cardiovascular disease; Q, quartile; TV, television.