Stimulant substance uses among healthcare professionals divided by the modality of work
| Substance, n (%) | Night shift workers | Day shift workers | P value, Pearson χ2 |
| Caffeine | 210 (78.9%) | 60 (75.9%) | p=0.335, 0.331 |
| Smoking | 68 (25.6%) | 12 (15.2%) | p=0.035, 3.687 |
| Stimulants pills | 12 (4.5%) | 1 (1.3%) | p=0.160, 1.773 |
n, frequency