Table 3.
Comparison of mean meteorological values on the days a virus is detectable or undetectable.
| Agent/(Number of days tested) | Meteorological factors | Mean on days virus was | Difference in means | 95% CI | p Value* | ||
|---|---|---|---|---|---|---|---|
| Detected | Not detected | Lower | Upper | ||||
| Adenoviruses (2148) | Temperature (°C) | 8.83 | 9.44 | −0.61 | −1.021 | −0.199 | 0.004 |
| Dew Point (°C) | 5.70 | 6.28 | −0.58 | −0.971 | −0.192 | 0.003 | |
| Relative Humidity (%) | 81.67 | 81.53 | 0.15 | −0.545 | 0.843 | 0.674 | |
| Humidity-range (%) | 26.76 | 27.83 | −1.07 | −2.15 | 0.01 | 0.052 | |
| Rhinoviruses (1949) | Temperature (°C) | 8.92 | 8.64 | 0.28 | −0.324 | 0.883 | 0.365 |
| Dew Point (°C) | 5.78 | 5.55 | 0.23 | −0.373 | 0.833 | 0.454 | |
| Relative Humidity (%) | 81.56 | 81.86 | −0.29 | −1.291 | 0.706 | 0.565 | |
| Humidity-range (%) | 26.91 | 27.30 | −0.39 | −2.012 | 1.239 | 0.640 | |
| RSV (2168) | Temperature (°C) | 6.27 | 10.69 | −4.42 | −4.801 | −4.035 | <0.001 |
| Dew Point (°C) | 3.70 | 7.24 | −3.55 | −3.926 | −3.172 | <0.001 | |
| Relative Humidity | 83.96 | 80.30 | 3.67 | 2.964 | 4.365 | <0.001 | |
| Humidity-range (%) | 21.79 | 30.40 | −8.61 | −9.672 | −7.557 | <0.001 | |
| IAV (2168) | Temperature (°C) | 6.73 | 10.22 | −3.50 | −3.912 | −3.079 | <0.001 |
| (%)Dew Point (°C) | 3.94 | 6.93 | −2.99 | −3.384 | −2.586 | <0.001 | |
| Relative Humidity | 82.93 | 80.99 | 1.94 | 1.203 | 2.666 | <0.001 | |
| Humidity-range (%) | 23.82 | 28.94 | −5.11 | −6.238 | −3.985 | <0.001 | |
| IBV (2168) | Temperature (°C) | 6.28 | 9.67 | −3.39 | −3.951 | −2.828 | <0.001 |
| Dew Point (°C) | 3.26 | 6.52 | 3.26 | −3.793 | −2.726 | <0.001 | |
| Relative Humidity (%) | 81.70 | 81.67 | 0.03 | −0.987 | 1.049 | 0.952 | |
| Humidity-range (%) | 24.60 | 27.87 | −3.27 | −4.805 | −1.743 | <0.001 | |
| HPIV-1 (2142) | Temperature (°C) | 9.03 | 9.14 | −0.11 | −0.659 | 0.442 | 0.698 |
| Dew Point (°C) | 6.08 | 5.97 | 0.11 | −0.413 | 0.634 | 0.689 | |
| Relative Humidity (%) | 82.55 | 81.42 | 1.13 | 0.173 | 2.089 | 0.021 | |
| Humidity-range (%) | 25.85 | 27.56 | −1.71 | −3.197 | −0.216 | 0.025 | |
| HPIV-2 (2142) | Temperature (°C) | 8.22 | 9.19 | −0.96 | −1.824 | −0.103 | 0.280 |
| Dew Point (°C) | 5.26 | 6.03 | −0.78 | −1.619 | 0.07 | 0.72 | |
| Relative Humidity (%) | 82.21 | 81.56 | 0.65 | −0.687 | 1.995 | 0.337 | |
| Humidity-range (%) | 26.42 | 27.35 | −0.93 | −3.036 | 1.179 | 0.386 | |
| HPIV-3 (2142) | Temperature (°C) | 9.36 | 9.05 | 0.32 | −0.166 | −0.796 | 0.199 |
| Dew Point (°C) | 5.86 | 6.02 | −0.16 | −0.617 | 0.298 | 0.495 | |
| Relative Humidity (%) | 79.86 | 82.16 | −2.30 | −3.102 | −1.498 | <0.001 | |
| Humidity-range (%) | 29.68 | 26.51 | 3.18 | 1.926 | 4.424 | <0.001 | |
| HMPV (1959) | Temperature (°C) | 7.42 | 9.56 | −2.15 | −2.601 | −1.698 | <0.001 |
| Dew Point (°C) | 4.35 | 6.42 | −2.06 | −2.493 | −1.637 | <0.001 | |
| Relative Humidity (%) | 81.75 | 81.62 | 0.13 | −0.665 | 0.925 | 0.748 | |
| Humidity-range (%) | 25.81 | 27.44 | −1.63 | −2.833 | −0.421 | 0.008 | |
CI: Confidence interval, p value from T test. Significant p values in bold. We measured the mean of each meteorological factor on days when we received positive samples for a given virus and on days where we did not receive a positive sample for that virus. Hence a larger difference in means denotes that a virus is commonly present at an extreme of that meteorological factor: e.g. RSV more often being present when temperature is lower.