Table 2.
Distribution of cases in each group during each 5 year
| Group | First 5 years (F5) N = 1681 (%) |
Middle 5 years (M5) N = 2380 (%) |
Last 5 years (L5) N = 3281 (%) |
(F5) versus (M5) ‘p’ value |
(M5) versus (L5) ‘p’ value |
(F5) versus (L5) ‘p’ value |
|---|---|---|---|---|---|---|
| I | II | III | ||||
| 1 | 594 (35.33) | 747 (31.38) | 857 (26.12) | Z = 2.62, p < 0.01 more significant | Z = 4.30, p < 0.001 highly significant | Z = 6.60, p < 0.001, highly significant, |
| 2A | 81 (4.81) | 127 (5.33) | 108 (3.290 | |||
| 2B | 161 (9.57) | 263 (11.05) | 698 (21.27) | Z = 1.54, p > 0.05 insignificant | Z = 10.6, p < 0.001 highly significant | Z = 11.5, p < 0.001 highly significant |
| 3 | 103 (6.12) | 148 (6.21) | 147 (4.48) | |||
| 4A | 23 (1.36) | 30 (1.26) | 33 (1.00) | |||
| 4B | 47 (2.79) | 71 (2.98) | 142 (4.32) | Z = 0.36, p > 0.05 insignificant | Z = 2.69, p < 0.01 more significant | Z = 2.85, p < 0.01 more significant |
| 5A | 263 (15.64) | 351 (14.74) | 333 (10.41) | Z = 0.78, p > 0.05 insignificant | Z = 4.8, p < 0.001 highly significant | Z = 5.06, p < 0.001 highly significant |
| 5B | 06 (0.35) | 05 (0.21) | 00 | |||
| 5C | 197 (11.71) | 337 (14.15) | 610 (18.59) | Z = 2.3, p < 0.05 significant | Z = 4.5, p < 0.001 highly significant | Z = 6.63, p < 0.001 highly significant |
| 6A | 55 (3.27) | 72 (3.02) | 43 (1.31) | |||
| 6B | 00 | 00 | 00 | |||
| 6C | 17 (1.01) | 35(1.47) | 84 (2.56) | |||
| 7A | 25 (1.48) | 46 (1.93) | 37 (1.12) | |||
| 7B | 00 | 00 | 00 | |||
| 7C | 19 (1.13) | 43 (1.80) | 61 (1.85) | |||
| 8A | 18 (1.07) | 31 (1.30) | 27 (0.82) | |||
| 8B | 00 | 01 (0.04) | 00 | |||
| 8C | 05 (0.29) | 13 (0.54) | 16 (0.48) | |||
| 9A | 23 (1.36) | 15 (0.63) | 10 (0.30) | |||
| 9B | 00 | 00 | 00 | |||
| 9C | 03 (0.17) | 03 (0.12) | 10 (0.30) | |||
| 10A | 14 (0.83) | 16 (0.67) | 36 (1.09) | |||
| 10 B | 03 (0.17) | 04 (0.16) | 02 (0.06) | |||
| 10C | 24 (1.42) | 22 (0.92) | 27 (0.82) |
* Z test for a difference between proportions is used to test the statistical significance (table value of Z = 1.96, p = 0.05; Z = 2.58, p = 0.01; Z = 3.29, p = 0.001)