Paired, longitudinal comparisons for hazmat technicians and support members: year 1 v year 3 (paired samples t tests)
| Variable | Year 1 (1996–7) | Year 3 (1998) | p Value |
| Liver function tests: | |||
| Alkaline phosphatase (U/l): | |||
| Technicians (n=246) | 83 (21) | 83 (20) | 0.721 |
| Support (n=53) | 87 (23) | 85 (20) | 0.206 |
| Aspartate aminotransferase (U/l): | |||
| Technicians (n=245) | 25 (10) | 25 (10) | 0.982 |
| Support (n=54) | 24 (10) | 26 (9) | 0.273 |
| Alanine aminotransferase(U/l): | |||
| Technicians (n=245) | 36 (20) | 37 (18) | 0.364 |
| Support (n=54) | 38 (23) | 39 (18) | 0.646 |
| Renal function tests: | |||
| Blood urea nitrogen (mmol/l):7-150 | |||
| Technicians (n=247) | 5.7 (1.4) | 5.3 (1.4) | 0.050 |
| Support (n=54) | 5.3 (1.4) | 5.7 (1.4) | 0.324 |
| Creatinine (μmol/l):7-151 | |||
| Technicians (n=247) | 97 (18) | 88 (8.8) | 0.000 |
| Support (n=54) | 97 (18) | 88 (18) | 0.005 |
| Haematological tests: | |||
| White blood cells (×109/l): | |||
| Technicians (n=245) | 6.7 (2.3) | 6.6 (1.8) | 0.891 |
| Support (n=54) | 6.6 (1.3) | 6.7 (1.5) | 0.635 |
| Packed cell volume (fraction): | |||
| Technicians (n=244) | 0.45 (0.02) | 0.46 (0.03) | 0.332 |
| Support (n=54) | 0.46 (0.03) | 0.46 (0.03) | 0.133 |
| Platelet count (×109/l): | |||
| Technicians (n=247) | 240 (52) | 232 (54) | 0.000 |
| Support (n=54) | 254 (60) | 248 (55) | 0.176 |