Independent Variable and Lag | Entire Study Period | (1993-2007) | Prior to Novel PCR | (1993 to April 2005) | Novel PCR | (May 2005 to December 2007) |
---|---|---|---|---|---|---|
 | Coefficient (95% CI) | P-value | Coefficient (95% CI) | P-value | Coefficient (95% CI) | P-value |
Test Positivity | Â | < 0.001* | Â | 0.55* | Â | 0.003* |
1 week lag | 0.49 (0.41 to 0.58) | < 0.001 | 0.20 (0.12 to 0.28) | < 0.001 | 0.56 (0.34 to 0.79) | < 0.001 |
2 week lag | 0.42 (0.33 to 0.51) | < 0.001 | 0.22 (0.14 to 0.30) | < 0.001 | 0.55 (0.31 to 0.79) | < 0.001 |
3 week lag | 0.16 (0.07 to 0.25) | < 0.001 | 0.18 (0.10 to 0.27) | < 0.001 | 0.10 (-0.14 to 0.34) | 0.42 |
4 week lag | -0.22 (-0.31 to -0.14) | < 0.001 | 0.07 (-0.01 to 0.16) | 0.07 | -0.42 (-0.64 to -0.20) | < 0.001 |
Test Volume | Â | Â | Â | Â | Â | Â |
1 week lag | 0.02 (0 to 0.04) | 0.05 | 0.01 (-0.01 TO 0.02) | 0.52 | 0.02 (-0.03 to 0.07) | 0.41 |
2 week lag | -0.06 (-0.08 to -0.04) | < 0.001 | -0.02 (-0.04 TO 0.01) | 0.08 | -0.09 (-0.15 to -0.03) | < 0.001 |
3 week lag | 0.03 (0.01 to 0.06) | < 0.001 | 0.01 (-0.01 TO 0.03) | 0.48 | 0.07 (0.01 to 0.13) | 0.03 |
4 week lag | 0.01 (0 to 0.03) | 0.11 | 0.00 (-0.01 TO 0.02) | 0.68 | 0.02 (-0.02 to 0.07) | 0.27 |
Test Positivity | Â | < 0.001* | Â | < 0.001* | Â | < 0.001* |
1 week lag | 1.41 (1.03 to 1.79) | < 0.001 | 0.44 (0.08 TO 0.80) | 0.02 | 1.81 (0.78 to 2.83) | < 0.001 |
2 week lag | 0.61 (0.21 to 1.01) | < 0.001 | 0.57 (0.21 TO 0.93) | < 0.001 | 0.94 (-0.15 to 2.02) | 0.09 |
3 week lag | -0.05 _0.45 to 0.36) | 0.83 | 0.17 (-0.20 TO 0.53) | 0.37 | -0.14 (-1.24 to 0.96) | 0.81 |
4 week lag | -1.04 (-1.42 to -0.67) | < 0.001 | -0.20 (-0.56 to 0.16) | 0.28 | -1.30 (-2.28 to -0.32) | 0.01 |
Test Volume | Â | Â | Â | Â | Â | Â |
1 week lag | 0.66 (0.58 to 0.74) | < 0.001 | 0.49 (0.41 to 0.57) | < 0.001 | 0.67 (0.45 to 0.90) | < 0.001 |
2 week lag | 0.01 (-0.08 to 0.11) | 0.77 | 0.22 (0.13 to 0.31) | < 0.001 | -0.15 (-0.41 to 0.12) | 0.29 |
3 week lag | 0.25 (0.15 to 0.35) | < 0.001 | 0.12 (0.04 to 0.21) | 0.01 | 0.39 (0.12 to 0.66) | 0.01 |
4 week lag | -0.08 (-0.16 to 0) | 0.04 | 0.05 (-0.03 to 0.12) | 0.26 | -0.11 (-0.30 to 0.09) | 0.28 |