Table 3.
Cumulative relative risk and 95% confidence intervals (CI) of kidney stone presentations associated with extremes of daily temperatures and varying adjustments for relative humidity.
| Summerc | Winterc | |||
|---|---|---|---|---|
| P99 Temp (°C) | RR (95% CI) | P1 Temp (°C) | RR (95% CI) | |
| Wet daytime | 24.9 | 1.13 (1.03, 1.25) | −5.8 | 1.09 (0.95, 1.25) |
| Wet 24-hour | 25.1 | 1.08 (1.01, 1.16) | −5.5 | 1.09 (0.95, 1.25) |
| Wet max/min | 27.1 | 1.11 (1.04, 1.19) | −8.9 | 1.08 (0.96, 1.23) |
| Heat Index daytime | 35.3 | 1.14 (10.4, 1.25) | -- | -- |
| Heat Index 24-hour | 35.5 | 1.13 (1.03, 1.24) | -- | -- |
| Heat Index max | 51.6 | 1.12 (1.01, 1.23) | -- | -- |
| Dry daytime† | 31.4 | 1.14 (1.04, 1.26) | −3.7 | 1.11 (0.97, 1.27) |
| Dry 24-hour† | 31.5 | 1.12 (1.04, 1.20) | −3.4 | 1.10 (0.97, 1.26) |
| Dry max/min† | 38.1 | 1.13 (1.04, 1.23) | −7.5 | 1.11 (0.97, 1.27) |
| Dry daytime, linear†† | 31.4 | 1.12 (1.01, 1.23) | −3.7 | 1.11 (0.97, 1.27) |
| Dry 24-hour, linear†† | 31.5 | 1.12 (1.02, 1.22) | −3.4 | 1.10 (0.96, 1.26) |
| Dry max/min, linear†† | 38.1 | 1.12 (1.02, 1.23) | −7.5 | 1.11 (0.96, 1.27) |
| Dry daytime, 2 df spline* | 31.4 | 1.11 (1.01, 1.23) | −3.7 | 1.11 (0.97, 1.27) |
| Dry 24-hour, 2 df spline* | 31.5 | 1.11 (1.01, 1.22) | −3.4 | 1.10 (0.97, 1.26) |
| Dry max/min, 2 df spline* | 38.1 | 1.12 (1.02, 1.22) | −7.5 | 1.10 (0.96, 1.27) |
| Dry daytime, 32 df spline** | 31.4 | 1.09 (1.01, 1.18) | −3.7 | 1.10 (0.96, 1.26) |
| Dry 24-hour, 32 df spline** | 31.5 | 1.09 (1.02, 1.18) | −3.4 | 1.10 (0.96, 1.26) |
| Dry max/min, 32 df spline** | 38.1 | 1.11 (1.01, 1.22) | −7.5 | 1.11 (0.96, 1.27) |
95% CIs: 95% confidence intervals
a
99th percentile of summer months
b
1st percentile of winter months
c
Referent temperature is the 50th percentile for both summer and winter months.
†
models did not adjust for relative humidity
††
models included a linear adjustment for relative humidity
*
models additionally adjusted for relative humidity as a natural spline with 2 degrees of freedom
**
: models additionally adjusted for relative humidity as a natural spline with 32 degrees of freedom