Table 3.
Description of all significant vomiting clusters (p ≤ 0.05) detected by the scan statistic during our test period (23 October 2005 to 21 May 2006)
| Year | Week | Location | Number of PCTs involved | Observed calls (O) | Expected calls (E) | O/E | p-value |
| (centroid PCT) | (radius in km) | [based on control period] | |||||
| 2005 | 40 | Portsmouth City Teaching | 11 (81) | 229 | 171 | 1.34 | 0.006 |
| 46 | East and North Hertfordshire | 9 (33) | 121 | 80 | 1.52 | 0.002 | |
| 49 | Suffolk | 31 (113) | 367 | 292 | 1.26 | 0.004 | |
| 50 | Luton | 4 (22) | 85 | 47 | 1.79 | 0.001 | |
| 51 | Bedfordshire | 5 (37) | 147 | 86 | 1.7 | 0.001 | |
| 51 | Hounslow | 41 (59) | 811 | 687 | 1.19 | 0.001 | |
| 52 | Eastern and Coastal Kent | 59 (167) | 1354 | 1204 | 1.12 | 0.007 | |
| 2006 | 01 | Hammersmith and Fulham | 43 (64) | 744 | 612 | 1.22 | 0.001 |
| 02 | Suffolk | 36 (115) | 525 | 412 | 1.27 | 0.001 | |
| 03 | Bexley | 56 (113) | 896 | 737 | 1.21 | 0.001 | |
| 04 | Great Yarmouth and Waveney | 29 (165) | 429 | 331 | 1.29 | 0.001 | |
| 04 | Milton Keynes | 55 (93) | 799 | 688 | 1.16 | 0.009 | |
| 05 | South Gloucestershire | 65 (161) | 1023 | 860 | 1.19 | 0.001 | |
| 05 | Brighton and Hove City | 46 (97) | 789 | 662 | 1.19 | 0.001 | |
| 05 | Cambridgeshire | 74 (144) | 1177 | 1046 | 1.12 | 0.009 | |
| 06 | Southampton city | 44 (116) | 822 | 689 | 1.19 | 0.002 | |
| 06 | Bedfordshire | 26 (67) | 480 | 394 | 1.22 | 0.007 | |
| 07 | East and North Hertfordshire | 18 (41) | 293 | 214 | 1.37 | 0.001 | |
| 09 | Bedfordshire | 11 (52) | 249 | 183 | 1.36 | 0.002 | |
| 10 | East and north Hertfordshire | 12 (37) | 241 | 164 | 1.47 | 0.001 | |
| 10 | Newcastle | 8 (46) | 156 | 108 | 1.45 | 0.002 | |
| 12 | Great Yarmouth and Waveney | 31 (167) | 469 | 370 | 1.27 | 0.001 |
PCT, Primary Care Trust