Table 2.
The effect of heat and cold according to maximum, minimum and mean daily temperature on stillbirth in Tehran
| Relative Risk (95% Confidence Interval) | |||||||
|---|---|---|---|---|---|---|---|
| Heat Effect | Cold Effect | ||||||
| Variable | Lag (day) | 99th vs 50th percentile | 95th vs 50th percentile | 75th vs 50th percentile | 1th vs 50th percentile | 5th vs 50th percentile | 25th vs 50th percentile |
| Maximum daily temperature | 0 | 1.07 (0.81–1.41) | 1.02 (0.79–1.29) | 0.93 (0.77–1.13) | 0.92 (0.72–1.19) | 0.98 (0.78–1.23) | 1.05 (0.89–1.24) |
| 1 | 1.03 (0.90–1.18) | 1.01 (0.89–1.13) | 0.96 (0.87–1.06) | 0.98 (0.87–1.11) | 0.997 (0.89–1.12) | 1.02 (0.94–1.11) | |
| 2 | 1.01 (0.92–1.11) | 1.00 (0.92–1.09) | 0.99 (0.92–1.06) | 1.03 (0.95–1.11) | 1.01 (0.94–1.09) | 1.01 (0.95–1.07) | |
| 3 | 1.00 (0.90–1.11) | 1.00 (0.91–1.10) | 0.999 (0.93–1.08) | 1.05 (0.96–1.15) | 1.02 (0.94–1.12) | 1.00 (0.94–1.07) | |
| 4 | 0.999 (0.90–1.11) | 1.00 (0.91–1.10) | 1.01 (0.93–1.08) | 1.05 (0.96–1.15) | 1.03 (0.95–1.12) | 1.00 (0.94–1.07) | |
| 5 | 1.00 (0.92–1.09) | 1.01 (0.93–1.09) | 1.01 (0.95–1.07) | 1.05 (0.97–1.12) | 1.03 (0.97–1.11) | 1.01 (0.96–1.06) | |
| 6 | 1.01 (0.94–1.08) | 1.01 (0.95–1.07) | 1.01 (0.96–1.06) | 1.04 (0.98–1.10) | 1.04 (0.98–1.09) | 1.02 (0.98–1.06) | |
| 7 | 1.01 (0.95–1.08) | 1.01 (0.96–1.07) | 1.01 (0.96–1.06) | 1.03 (0.98–1.08) | 1.04 (0.99–1.09) | 1.03 (0.99–1.06) | |
| Minimum daily temperature | 0 | 1.25 (0.95–1.65) | 1.17 (0.94–1.47) | 1.05 (0.89–1.25) | 0.93 (0.74–1.16) | 1.03 (0.85–1.24) | 1.06 (0.93–1.22) |
| 1 | 1.11 (0.98–1.26) | 1.08 (0.97–1.19) | 1.03 (0.95–1.12) | 0.97 (0.87–1.08) | 1.00 (0.91–1.10) | 1.02 (0.95–1.09) | |
| 2 | 1.02 (0.93–1.12) | 1.02 (0.94–1.10) | 1.01 (0.95–1.08) | 0.99 (0.92–1.07) | 0.99 (0.92–1.06) | 0.99 (0.94–1.04) | |
| 3 | 0.98 (0.88–1.09) | 0.99 (0.91–1.09) | 1.01 (0.94–1.08) | 1.01 (0.92–1.10) | 0.99 (0.91–1.07) | 0.98 (0.93–1.04) | |
| 4 | 0.98 (0.88–1.08) | 0.99 (0.91–1.08) | 1.01 (0.94–1.08) | 1.01 (0.93–1.10) | 0.99 (0.92–1.08) | 0.99 (0.93–1.04) | |
| 5 | 0.99 (0.91–1.07) | 0.999 (0.93–1.07) | 1.01 (0.96–1.07) | 1.01 (0.94–1.08) | 1.01 (0.95–1.07) | 0.998 (0.95–1.04) | |
| 6 | 1.00 (0.94–1.07) | 1.01 (0.96–1.07) | 1.02 (0.97–1.07) | 1.01 (0.95–1.07) | 1.02 (0.97–1.07) | 1.01 (0.97–1.05) | |
| 7 | 1.02 (0.96–1.08) | 1.02 (0.97–1.08) | 1.02 (0.98–1.07) | 1.00 (0.95–1.06) | 1.03 (0.98–1.08) | 1.02 (0.98–1.05) | |
| Mean daily temperature | 0 | 1.14 (0.86–1.52) | 1.07 (0.83–1.39) | 0.97 (0.79–1.17) | 0.93 (0.73–1.19) | 1.01 (0.81–1.26) | 1.07 (0.91–1.26) |
| 1 | 1.07 (0.93–1.23) | 1.04 (0.92–1.18) | 0.98 (0.89–1.09) | 0.98 (0.87–1.10) | 1.01 (0.90–1.12) | 1.03 (0.95–1.11) | |
| 2 | 1.02 (0.93–1.13) | 1.01 (0.93–1.11) | 0.998 (0.93–1.08) | 1.01 (0.94–1.09) | 1.00 (0.93–1.08) | 0.998 (0.94–1.06) | |
| 3 | 1.00 (0.89–1.12) | 1.01 (0.91–1.11) | 1.01 (0.93–1.10) | 1.03 (0.94–1.13) | 1.01 (0.92–1.09) | 0.99 (0.93–1.06) | |
| 4 | 0.999 (0.89–1.11) | 1.01 (0.91–1.11) | 1.01 (0.93–1.10) | 1.03 (0.95–1.13) | 1.01 (0.93–1.10) | 0.99 (0.93–1.06) | |
| 5 | 1.01 (0.92–1.10) | 1.01 (0.93–1.10) | 1.02 (0.95–1.09) | 1.03 (0.96–1.11) | 1.02 (0.96–1.09) | 1.01 (0.96–1.06) | |
| 6 | 1.01 (0.94–1.09) | 1.02 (0.95–1.09) | 1.02 (0.97–1.08) | 1.02 (0.97–1.09) | 1.03 (0.98–1.08) | 1.02 (0.98–1.06) | |
| 7 | 1.02 (0.96–1.09) | 1.02 (0.96–1.09) | 1.02 (0.97–1.08) | 1.02 (0.97–1.09) | 1.03 (0.99–1.08) | 1.03 (0.99–1.06) | |