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Comparison of incidence rates of EA between the two groups (n(%)).
| Grade | Control group (n = 57) | Experimental group (n = 58) | t | P |
|---|---|---|---|---|
| 0 | 36 (63.16) | 50 (86.21) | ||
| I | 13 (22.81) | 5 (8.62) | ||
| II | 5 (8.77) | 2 (3.45) | ||
| III | 3 (5.26) | 1 (1.72) | ||
| Total incidence rate | 21 (36.84) | 8 (13.79) | 8.0986 | 0.004 |
