Table 2. The effect of Free Practice (FP) on OSCE performance (PSM).
| FP | No FP | Difference | S.E. | T-Stat. | Common support | |
|---|---|---|---|---|---|---|
| Physical examination | ||||||
| Unmatched | 90.85% | 85.02% | 5.83% | 0.965 | 6.05 | |
| ATT | 90.85% | 85.98% | 4.87% | 1.030 | 4.72 | 243/245 |
| Neurological examination | ||||||
| Unmatched | 85.56% | 83.36% | 2.20% | 1.509 | 1.46 | |
| ATT | 85.56% | 83.73% | 1.83% | 1.524 | 1.20 | 245/245 |
| Anamnesis | ||||||
| Unmatched | 83.96% | 83.38% | 0.58% | 1.554 | 0.38 | |
| ATT | 83.96% | 83.60% | 0.36% | 1.515 | 0.24 | 244/245 |
| Diagnosis | ||||||
| Unmatched | 84.71 | 84.37 | 0.34% | 1.217 | 0.28 | |
| ATT | 84.71 | 84.26 | 0.45% | 1.221 | 0.38 | 245/245 |
| Medical Skills | ||||||
| Venipuncture | ||||||
| Unmatched | 94.48% | 96.35% | -1.87% | 2.212 | -0.85 | |
| ATT | 93.76% | 96.53% | -2.77% | 2.542 | -1.09 | 57/86 |
| ECG | ||||||
| Unmatched | 92.46% | 92.91% | -0.45% | 2.872 | -0.16 | |
| ATT | 91.2% | 93.12% | -1.92% | 3.499 | -0.55 | 42/48 |
| PVC | ||||||
| Unmatched | 94.86% | 87.58% | 7.28% | 2.129 | 3.42 | |
| ATT | 94.53% | 84.55% | 9.98% | 4.966 | 2.01 | 109/135 |
| Feeding tube | ||||||
| Unmatched | 93.26% | 89.91% | 3.35% | 2.285 | 1.47 | |
| ATT | 92.00% | 89.28% | 2.72% | 2.893 | 0.94 | 52/61 |
| Rectal examination | ||||||
| Unmatched | 93.45% | 88.52% | 4.93% | 1.834 | 2.69 | |
| ATT | 93.85% | 89.30% | 4.55% | 2.281 | 1.99 | 36/45 |
| Injections | ||||||
| Unmatched | 97.06% | 91.77% | 5.29% | 1.562 | 3.39 | |
| ATT | 97.06% | 90.76% | 6.30% | 2.015 | 3.13 | 84/84 |
Average treatment effects on the treated (ATT) obtained from Propensity Score Matching with the parameters gender, vocational training, school-leaving grade, the average exam grade in the M1-phase and a binary indicator taking the value = 1 if all exams preceding the OSCE had been passed. Kernel matching (Epanechnikov kernel) with replacement and a strict condition of common support. For quality of matching tests, see Table 3 and Supplement 3 in S1 File. For propensity score estimates, see Supplement 2. A T-Statistic > |1.96| corresponds to p<0.05. Common support denotes how many of the respective total respondents could be used for matching. “Unmatched” is a sample test for the groups Free Practice (FP) and No FP. S.E.: standard error.