Table 2 Adjusted OR for the odds of being a hospital control according to demographic, lifestyle factors
From: Population versus hospital controls for case-control studies on cancers in Chinese hospitals
Characteristics | No. hospital/population controls | Adjusted ORa (95% CI) |
|---|---|---|
Education | ||
No or primary school | 46/37 | 1.00b |
Junior high school | 208/219 | 0.65 (0.38, 1.11) |
Senior high school | 119/106 | 0.80 (0.45, 1.41) |
Tertiary education | 167/178 | 0.65 (0.37, 1.14) |
Income (per capita, Yuan/month) | ||
≤ 1000 | 69/80 | 1.00 |
1001-2000 | 347/330 | 1.50 (0.96, 2.33) |
≥ 2001 | 124/130 | 1.54 (0.91, 2.61) |
Marital status | ||
Married | 499/504 | 1.00 |
Others | 41/36 | 1.13 (0.66, 1.94) |
Household size | ||
1-2 | 209/158 | 1.00 |
3 | 220/288 | 0.46 (0.32, 0.65) |
≥ 4 | 111/94 | 0.83 (0.58, 1.19) |
BMI (kg/m2) | ||
< 25 | 387/349 | 1.00 |
≥ 25 | 153/191 | 0.71 (0.54, 0.93) |
Malignancies in first degree relatives | ||
No | 459/450 | 1.00 |
Yes | 81/90 | 0.84 (0.59, 1.17) |
Smoking (≥ 20 packs in lifetime) | ||
No | 442/436 | 1.00 |
Yes | 98/104 | 0.86 (0.58, 1.28) |
Years of smoking | ||
0 | 442/436 | 1.00 |
≤ 20 | 29/38 | 0.69 (0.40, 1.20) |
> 20 | 69/66 | 1.00 (0.62, 1.63) |
Number of cigarettes per day | ||
0 | 442/436 | 1.00 |
≤ 10 | 33/40 | 0.73 (0.42, 1.26) |
> 10 | 65/64 | 0.95 (0.60, 1.50) |
Quitting smoking | ||
No | 520/528 | 1.00 |
Yes | 20/12 | 1.55 (0.74, 3.24) |
Alcohol consumption | ||
No | 347/338 | 1.00 |
Yes | 193/202 | 0.92 (0.68, 1.24) |
Alcohol consumption (ethanol g/day) | ||
0 | 347/338 | 1.00 |
≤ 15 | 140/145 | 0.91 (0.66, 1.25) |
> 15 | 53/57 | 0.94 (0.56, 1.58) |
Green tea drinking frequency | ||
Never or seldom | 363/362 | 1.00 |
≤ 6 times a week | 53/58 | 0.94 (0.61, 1.43) |
≥ 1 times per day | 124/120 | 1.08 (0.79, 1.48) |
Years of green tea drinking | ||
0 | 363/362 | 1.00 |
≤ 10 | 92/91 | 1.05 (0.75, 1.49) |
> 10 | 85/87 | 1.00 (0.69, 1.46) |
Dried green tea leaves (g/year) | ||
0 | 363/362 | 1.00 |
< 500 | 52/61 | 0.81 (0.52, 1.25) |
500- < 1000 | 66/50 | 1.45 (0.95, 2.22) |
≥ 1000 | 59/67 | 0.88 (0.58, 1.34) |
Physical activity (MET hrs/week) | ||
≤ 27.42 | 132/135 | 1.00 |
> 27.42-43.75 | 126/135 | 0.97 (0.68, 1.39) |
> 43.75-73.25 | 158/135 | 1.22 (0.86, 1.73) |
> 73.25 | 124/135 | 1.01 (0.69, 1.47) |