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Tympanograms for the 3 Periods.
| 1: May-Jun 2019 | 2: Jan-Feb 2020 a | 3: May-Jun 2020 b | ||||
|---|---|---|---|---|---|---|
| Tympanogram | No. | % | No. | % | No. | % |
| A | 157 | 44.9 | 98 | 26.8 | 204 | 94.4 |
| B | 142 | 40.6 | 191 | 52.2 | 5 | 2.3 |
| C1 | 31 | 8.9 | 39 | 10.7 | 6 | 2.8 |
| C2 | 20 | 5.7 | 38 | 10.4 | 1 | 0.5 |
| Total | 350 | 100.0 | 366 | 100.0 | 216 | 100.0 |
Period 2 vs 1: chi-square, P < .001.
Period 3 vs 1: chi-square, P < .001.
