Assessment of the age-specific disability weight of chronic schistosomiasis japonica
Tie-Wu Jia, Xiao-Nong Zhou, Xian-Hong Wang, Jürg Utzinger, Peter Steinmann, Xiao-Hua Wu
Volume 85, Number 6, June 2007, 458-465
Table 6. Results of multilevel regression model 2 exploring the relationship between the disability weight of chronic schistosomiasis japonica and related morbidity, in two counties in China, October 2004–January 2005 (n = 1407)a
| Parameter | Coefficient | Standard error | Z or t valueb | P value |
|---|---|---|---|---|
| Intercept | 0.1068 | 0.01616 | 6.61 | < 0.001 |
| Fixed effects | ||||
| Age group (years)c | ||||
| 15–44 | –0.01621 | 0.01902 | –0.85 | 0.396 |
| 45–59 | 0.01456 | 0.01934 | 0.75 | 0.453 |
| ⩾ 60 | 0.05380 | 0.01979 | 2.72 | 0.008 |
| Sexd | –0.01698 | 0.00416 | –4.08 | < 0.001 |
| Occupatione | ||||
| Civil servant, employee, business person | 0.02165 | 0.02422 | 0.89 | 0.378 |
| Farmer | 0.03615 | 0.01589 | 2.28 | 0.029 |
| Fisherman, boatman | 0.05108 | 0.02610 | 1.96 | 0.059 |
| Self-reported signs and symptoms | ||||
| Abdominal pain | 0.01331 | 0.00505 | 2.64 | 0.008 |
| Diarrhoea | 0.01582 | 0.00548 | 2.89 | 0.004 |
| Blood in the stool | 0.02402 | 0.00655 | 3.67 | < 0.001 |
| Working capacity | 0.03866 | 0.00636 | 6.08 | < 0.001 |
| Pathology | ||||
| Hepatic fibrosisf | ||||
| Grade I | 0.01226 | 0.00575 | 2.13 | 0.036 |
| Grade II | 0.03515 | 0.00723 | 4.86 | < 0.001 |
| Grade III | 0.04598 | 0.01489 | 3.09 | 0.003 |
| Hepatomegaly | 0.02782 | 0.00669 | 4.16 | < 0.001 |
| Random effects | ||||
| Village | 0.00309 | 0.00064 | 4.84 | < 0.001 |
| Residual | 0.00432 | 0.00017 | 25.45 | < 0.001 |
a 12 participants were excluded owing to missing values.b Z value for random effects and t value for fixed effects.c Reference group: 5–14-year-olds.d Reference group: females.e Reference group: schoolchildren and students.f Reference group: no hepatic fibrosis (grade 0).