| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|
Observed | 396 | 394 | 466 | 453 | 439 | 428 | 396 | 378 | 335 | 260 | 330 | 333 |
Expected | 374 | 414 | 446 | 462 | 456 | 432 | 394 | 354 | 322 | 306 | 312 | 336 |
- * The month-specific observed number of cases is weighted by the average monthly number of migrants tested (i.e. observed proportion of TB positives in given month × average monthly number of workers tested during the entire study period; i.e. N/12). Subsequently weighted number of observed cases was re-adjusted to have total weighted number of TB cases equal to total number of actual observed cases.
- (e.g. For January observed weighted number of cases = [(206/100,000) × 194049] = 400.292 ≅ 400 (after rounding down)
- For January, re-adjusted observed weighted number of cases = (400/4659) × 4608 = 396
-
where; 4659 is the total observed weighted number of cases calculated from January through December by rounding up or down as required and 4608 are actual number of observed cases in the study..
- The expected (calculated for the best simple harmonic curve) number of cases has been adjusted by the number of days in the month χ
2 = 0.224; df = 11 P > 0.1
