Antibiotic prescribing strategy | Symptom severity, mean (SD) | Difference (95% CI), P-value | Difference controlling for clustering and, antibiotic type and baseline severity score (95% CI), P-value | Difference controlling for propensity score (95% CI), P-value | Difference controlling for propensity score in the imputed dataset (95% CI), P-value |
---|---|---|---|---|---|

None (reference) n= 585 | 2.13 (1.24) | ||||

Immediaten= 723 | 2.03 (1.20) | −0.10 (−0.23 to 0.03), P = 0.140 | −0.30 (−0.49 to −0.21), P = 0.001 | −0.22 (0.44 to −0.01), P = 0.040 | −0.22 (−0.43 to −0.01), P = 0.043 |

Delayedn= 196 | 1.95 (1.19) | −0.17 (−0.37 to 0.02), P = 0.834 | −0.22 (−0.42 to −0.02), P = 0.034 | −0.26 (−0.45 to −0.7), P = 0.009 | −0.26 (−0.45 to −0.07), P = 0.008 |

*SD = standard deviation.*