Relative risk of suicide associated with the level of air pollen counts, stratified by history of mood disorder
| Pollen counts | Without mood disorder | With mood disorder | Difference by mood disorder† | ||
|---|---|---|---|---|---|
| RR‡ | 95% CI | RR‡ | 95% CI | ||
| Total | |||||
| 0 | 1 | 1 | χ2=6.3897 df=4.1074 p=0.1816 | ||
| <10 | 1.001 | 0.947 to 1.059 | 1.125 | 0.989 to 1.279 | |
| 10–<30 | 1.056 | 0.993 to 1.123 | 1.164* | 1.009 to 1.343 | |
| 30–100 | 1.100** | 1.048 to 1.155 | 1.186** | 1.059 to 1.329 | |
| >100 | 1.015 | 0.956 to 1.079 | 1.148* | 1.001 to 1.318 | |
| Males | |||||
| 0 | 1 | 1 | χ2=9.6604 df=4.1001 p=0.0498 | ||
| <10 | 1.042 | 0.974 to 1.115 | 1.248** | 1.039 to 1.499 | |
| 10–<30 | 1.034 | 0.958 to 1.115 | 1.334** | 1.092 to 1.631 | |
| 30–100 | 1.072* | 1.009 to 1.138 | 1.169 | 0.988 to 1.384 | |
| >100 | 1.043 | 0.969 to 1.122 | 1.229* | 1.007 to 1.501 | |
| Females | |||||
| 0 | 1 | 1 | χ2=3.6531 df=4.1342 p=0.4754 | ||
| <10 | 0.911 | 0.824 to 1.007 | 1.015 | 0.847 to 1.216 | |
| 10–<30 | 1.091 | 0.982 to 1.213 | 1.010 | 0.824 to 1.239 | |
| 30–100 | 1.146** | 1.055 to 1.245 | 1.179* | 1.011 to 1.374 | |
| >100 | 0.966 | 0.869 to 1.074 | 1.065 | 0.880 to 1.288 | |
*p<0.05; **p<0.01.
†The p value represents the reduction down to a model estimating the effect of levels of pollen counts adjusted for region, history of mood disorder, calendar time, temperature, cloud cover and humidity in the total participants, the men and the women, respectively.
‡Estimates of relative risk were derived from the model adjusted for region, calendar time, temperature, cloud cover and humidity.
RR, relative risk.