Table.
Serum vitamin D level in relation to age, gender, body mass index, smoking, diet and sunlight exposure in patients with schizophrenia
| Independent variable | Vitamin D level (ng/ml); mean±SD | Test statistic | P |
|---|---|---|---|
| Age (yr) | |||
| 18-35 | 15.6±4.4 | F (2, 71)=0.3 | 0.75 |
| 35-55 | 16.7±6.2 | ||
| >55 | 16.6±5.9 | ||
| Gender | |||
| Male | 17.1±5.7 | t (72)=1.8 | 0.07 |
| Female | 14.7±4.8 | ||
| BMI (kg/m2) | |||
| <18.5 | 15.8±6.4 | F (2, 71)=206.9 | 0.03 |
| 18.5-24.9 | 17.9±5.7 | ||
| >25 | 14.4±4.4 | ||
| Nicotine | |||
| Dependent | 19.2±7.2 | U=227.5, Z=−1.5 | 0.14 |
| Absent | 15.8±5.1 | ||
| Diet | |||
| Non-vegetarian | 16.6±5.5 | U=114, Z=−1.8 | 0.75 |
| Vegetarian | 17.6±1.3 | ||
| Sunlight exposure (h) | |||
| <1 | 15.7±5.2 | F (2, 71)=1.5 | 0.23 |
| 1-3 | 18.8±7.1 | ||
| >3 | 16.5±4.5 |
SD, standard deviation; BMI, body mass index