Table 4.
Rate of use and percentage difference in change of use of antibiotics, laboratory tests, and telephone consultations
| Sore throat arm
|
Urinary tract infection arm
|
||||
|---|---|---|---|---|---|
| Intervention group
|
Control group
|
Intervention group
|
Control group
|
||
| Use of antibiotics: | |||||
| Baseline | 48.1 (2590/5387) | 50.8 (1721/3386) | 46.5 (886/1906) | 43.2 (1080/2498) | |
| Follow up | 43.8 (2202/5031) | 49.5 (1552/3135) | 46.3 (1167/2522) | 43.4 (1285/2961) | |
| Percentage change | −4.3 | −1.3 | −0.2 | 0.2 | |
| Percentage difference | 3.0 | 0.4 | |||
| Intracluster correlation coefficient (95% CI) | 0.085 (0.056 to 0.114) | 0.085 (0.057 to 0.113) | |||
| P value* | 0.032 | 0.639 | |||
| Use of laboratory test: | |||||
| Baseline | 44.6 (2402/5387) | 41.9 (1419/3386) | 53.4 (1018/1906) | 53.5 (1336/2498) | |
| Follow up | 42.0 (2111/5031) | 39.7 (1246/3135) | 49.8 (1256/2522) | 55.0 (1629/2961) | |
| Percentage change | −2.6 | −2.2 | −3.6 | 1.5 | |
| Percentage difference | 0.5 | 5.1 | |||
| Intracluster correlation coefficient (95% CI) | 0.207 (0.148 to 0.266) | 0.119 (0.0824 to 0.156) | |||
| P value* | 0.638 | 0.046 | |||
| Use of telephone consultations: | |||||
| Baseline | 12.5 (645/5164) | 12.5 (393/3152) | 20.1 (354/1764) | 20.1 (472/2348) | |
| Follow up | 12.9 (612/4751) | 14.1 (417/2956) | 19.8 (458/2318) | 18.9 (533/2822) | |
| Percentage change | 0.4 | 1.6 | −0.3 | −1.2 | |
| Percentage difference | 1.2 | 0.9 | |||
| Intracluster correlation coefficient (95% CI) | 0.050 (0.032 to 0.068) | 0.076 (0.050 to 0.102) | |||
| P value* | 0.128 | 0.874 | |||
*
Based on significance of time-intervention interaction term in hierarchical logistic regression (see box).