Table 4.
Zero-day relative risks for ETEs by region, and number of statistically significant metropolitan areas.
| ECE | Overall | Dec | Jan | Feb |
| NATIONAL | 1.029 (1.023,1.035) | 1.025 (1.015,1.035) | 1.035 (1.029,1.041) | 1.023 (1.013,1.033) |
| Northeast | 1.031 (1.017,1.044) | 1.038 (1.016,1.061) | 1.029 (1.014,1.044) | 1.029 (1.009,1.048) |
| Midwest | 1.025 (1.016,1.034) | 1.013 (0.993,1.034) | 1.033 (1.022,1.044) | 1.002 (0.981,1.024) |
| Southeast | 1.051 (1.039,1.064) | 1.044 (1.020,1.069) | 1.055 (1.039,1.071) | 1.032 (0.999,1.067) |
| Central | 1.036 (1.020,1.053) | 1.036 (1.009,1.064) | 1.031 (1.005,1.058) | 1.047 (1.011,1.084) |
| Southeast Coast | 1.045 (1.032,1.058) | 1.054 (1.032,1.076) | 1.041 (1.023,1.059) | 1.031 (0.986,1.078) |
| Desert | 1.002 (0.984,1.021) | 0.996 (0.974,1.019) | 1.013 (0.972,1.056) | 1.006 (0.967,1.046) |
| Pacific | 1.010 (0.996,1.024) | 1.002 (0.981,1.024) | 1.021 (0.993,1.050) | 1.023 (1.000,1.047) |
| S.S. Metros | 23 | 9 | 14 | 4 |
| EHE | Overall | JUN | JUL | AUG |
| NATIONAL | 1.084 (1.071,1.097) | 1.077 (1.057,1.097) | 1.098 (1.084,1.113) | 1.068 (1.048,1.088) |
| Northeast | 1.142 (1.101,1.184) | 1.130 (1.075,1.189) | 1.147 (1.108,1.187) | 1.132 (1.083,1.182) |
| Midwest | 1.090 (1.067,1.112) | 1.061 (1.032,1.090) | 1.110 (1.083,1.139) | 1.072 (1.037,1.108) |
| Southeast | 1.073 (1.059,1.086) | 1.021 (0.989,1.055) | 1.108 (1.084,1.133) | 1.025 (1.001,1.050) |
| Central | 1.055 (1.032,1.079) | 1.078 (1.027,1.132) | 1.067 (1.040,1.095) | 1.019 (0.994,1.045) |
| Southeast Coast | 1.029 (1.017,1.040) | 1.028 (1.004,1.053) | 1.038 (1.014,1.062) | 1.022 (0.997,1.048) |
| Desert | 1.065 (1.040,1.091) | 1.099 (1.040,1.160) | 1.069 (1.047,1.093) | 1.076 (1.019,1.136) |
| Pacific | 1.123 (1.095,1.152) | 1.161 (1.122,1.202) | 1.113 (1.087,1.139) | 1.142 (1.067,1.223) |
| S.S. Metros | 43 | 19 | 42 | 21 |
| RECE | Overall | FALL | SPRING | |
| NATIONAL | 1.009 (1.002,1.015) | 1.006 (0.998,1.014) | 1.012 (0.998,1.026) | |
| Northeast | 1.015 (1.002,1.029) | 0.993 (0.975,1.011) | 1.043 (1.023,1.064) | |
| Midwest | 1.007 (0.992,1.021) | 1.006 (0.989,1.024) | 1.006 (0.973,1.040) | |
| Southeast | 1.002 (0.983,1.021) | 0.988 (0.956,1.021) | 1.022 (0.981,1.064) | |
| Central | 1.011 (0.989,1.034) | 1.022 (0.994,1.050) | 0.992 (0.950,1.035) | |
| Southeast Coast | 1.026 (1.010,1.043) | 1.035 (1.013,1.057) | 1.016 (0.991,1.042) | |
| Desert | 0.990 (0.960,1.020) | 1.000 (0.967,1.035) | 0.961 (0.926,0.998) | |
| Pacific | 0.998 (0.980,1.017) | 0.998 (0.978,1.019) | 0.998 (0.962,1.035) | |
| S.S. Metros | 3 | 3 | 6 | |
| REHE | Overall | SPRING | ||
| NATIONAL | 1.018 (1.010,1.025) | 1.020 (1.011,1.030) | ||
| Northeast | 1.046 (1.035,1.057) | 1.050 (1.038,1.063) | ||
| Midwest | 1.015 (1.003,1.026) | 1.018 (1.001,1.035) | ||
| Southeast | 1.003 (0.989,1.017) | 1.002 (0.985,1.020) | ||
| Central | 1.009 (0.985,1.034) | 0.999 (0.973,1.026) | ||
| Southeast Coast | 0.992 (0.979,1.005) | 0.995 (0.979,1.010) | ||
| Desert | 1.019 (1.000,1.038) | 1.023 (1.002,1.045) | ||
| Pacific | 1.045 (1.020,1.070) | 1.052 (1.019,1.085) | ||
| S.S. Metros | 10 | 10 |