Table 3. The median transmission duration, cluster size and growth rate of clusters with different number of serotypes present in Singapore (2014–2016), and separated by lowa and highb risk areas.
No. of serotypes in cluster | Median transmission duration (days) | Median cluster size (no. of cases) | Median growth rate (no. of new cases per day) | No. of clusters | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Combined* | Low risk areas | High risk areas | Combined* | Low risk areas | High risk areas | Combined* | Low risk areas | High risk areas | Combined | Low risk areas | High risk areas | |
1 | 13 | 13 | 13 | 4 | 4 | 4 | 0.28 | 0.28 | 0.28 | 1319 | 168 | 1129 |
2 | 21 | 18 | 21 | 7 | 7 | 7 | 0.35 | 0.34 | 0.35 | 328 | 32 | 291 |
3 | 53 | n/a | 93 | 25 | n/a | 70 | 0.52 | n/a | 0.68 | 31 | 0 | 30 |
4 | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | 0 | 0 | 0 |
a Low risk areas are RG 1 and RG 2 grids.
b High risk areas are RG 3 and RG 4 grids.
n/a, data not available
Kruskal-Wallis test (P <0.01 are highlighted by *)