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Shapiro-Wilk test for normality. The critical region (.908) for a sample size of 21 and significance level of α=.05 was obtained from the critical values of Wn,a for the Shapiro-Wilk test.
| Variable | Statistic | P value |
| Coronavirus | .945 | .28 |
| Pneumonia | .861 | .007 |
| Fever | .946 | .29 |
| Cough | .944 | .26 |
| Lost sense of smell | .885 | .02 |
| Sore throat | .929 | .13 |
| Diarrhea | .877 | .01 |
| Fatigue | .952 | .36 |
