The average white blood cells (WBC) count, haematocrit, and platelet count, and their associations* with driving time in Taxi Drivers’ Health Study, Taipei, Taiwan
| Monthly driving time (hours) | WBC count (cells ×106/l)† | Adjusted‡ regression coefficients | Haematocrit (%)† | Adjusted§ regression coefficients | Platelets count (cells ×109/l)† | Adjusted¶ regression coefficients |
|---|---|---|---|---|---|---|
| *All regression coefficients obtained from multiple regression were expressed as the difference in average levels of haematological markers between the reference and the indicated categories. | ||||||
| †Results shown as mean (standard deviation). | ||||||
| ‡Adjusted for age, sex, marital status, education, registration type, exercise frequency, alcohol drinking, BMI, smoking, hypertension, diabetes, and hypercholesterolaemia. | ||||||
| §Adjusted for age, sex, professional seniority, marital status, income, registration type, BMI, smoking, hypertension, diabetes, and hypercholesterolaemia. | ||||||
| ¶Adjusted for age, gender, marital status, education, income, registration type, BMI, smoking, hypertension, diabetes, and hypercholesterolaemia. | ||||||
| **p<0.05. | ||||||
| 1st quartile (⩽208) | 6420 (1599) | Reference | 46.6 (3.6) | Reference | 236.9 (50.6) | reference |
| 2nd quartile (210–260) | 6680 (1686) | 264 (−2 to 529) | 47.2 (3.7) | 0.3 (−0.3 to 0.8) | 241.9 (53.9) | 2.7 (−6.4 to 11.8) |
| 3rd quartile (261–312) | 6733 (1671) | 278 (20 to 539)** | 47.3 (3.1) | 0.1 (−0.5 to 0.6) | 245.5 (51.7) | 7.5 (−1.4 to 16.4) |
| 4th quartile (318–450) | 6799 (1652) | 285 (16 to 555)** | 47.6 (3.3) | 0.4 (−0.1 to 1.0) | 246.9 (53.4) | 9.6 (0.3 to 18.9)** |
| (p value for trend test) | 0.006 | 0.04 | 0.001 | 0.24 | 0.01 | 0.02 |