Author | 1. Study participation | 2. Study attrition | 3. Determinant measurement | 4. Outcome measurement | 5. Study confounding | 6. Statistical analysis and reporting | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
5a. Confounders measured | Â | Â | 5d. Confounders accounted for in analysis | |||||||||||||||||||
 | 1a. Consecutive series of participants | 1b. Adequate participation rate (> 70%) | 2a. Adequate follow-up rate (≥80%) | 2b. No important differences between participants and drop-out | 3a. ≥70% complete data for each determinant | 3b. Method and setting of the measurement is the same for all study participants | 3c. Appropriate methods of imputation | 4a. Outcome measurement truly captures volunteering | 4b. Method and setting of measurement is the same for all study participants | 5a1. Age | 5a2. Socioeconomic Status | 5a3. Gender | 5a4. Participation in voluntary work at baseline | 5b. Method and setting of measurement is the same for all study participants | 5c. Appropriate methods of imputation | 5d1. Age | 5d2. Socioeconomic Status | 5d3. Gender | 5d4. Participation in voluntary work at baseline | 6a. Statistical model adequate for study design | 6b. No overfitting | 6c. No selective reporting of results |
Ajrouch et al. [18] | + | + | – | ? | + | + | N.A.b | + | + | + | + | + | – | + | N.A. | + | + | + | – | + | + | + |
Bartels et al. [19] | + | ? | ? | ? | ? | + | ? | + | + | – | + | + | + | + | ? | – | + | + | + | + | + | + |
Bekkers [20] | – | ? | – | + | ? | + | ? | + | + | + | + | + | + | + | ? | – | – | – | – | + | + | + |
Broese van Groenou & Van Tilburg [21] | + | – | – | ? | ? | + | ? | + | + | + | + | + | + | + | ? | + | + | + | + | + | + | + |
Choi & Chou [22] | + | – | – | + | ? | + | ? | + | + | + | + | + | + | + | ? | + | + | + | + | + | +/−c | + |
Cramm & Nieboer [23] | – | – | – | – | ? | + | N.A. | + | + | + | + | + | + | + | N.A. | + | + | + | + | + | – | + |
Curl et al. [24] | + | ? | ? | ? | + | + | N.A. | + | + | + | + | + | + | + | N.A. | + | + | + | + | + | + | + |
Curl et al. [25] | + | ? | ? | ? | + | + | N.A. | + | + | + | + | + | + | + | N.A. | + | + | + | + | + | + | + |
Einolf & Philbrick [26] | + | ? | + | ? | ? | + | ? | + | + | + | + | + | + | + | ? | + | + | + | + | + | + | + |
Hank & Erlinghagen [27] | + | – | – | ? | ? | ? | ? | + | ? | + | + | + | + | ? | ? | + | + | + | + | + | + | + |
Johnston [28] | + | – | – | ? | ? | + | ? | + | + | + | + | + | + | + | ? | – | + | + | + | + | + | + |
Lim & Mac Gregor [29] | + | ? | – | ? | ? | + | ? | + | + | + | + | + | + | + | ? | + | + | + | + | + | + | + |
McNamara & Gonzales [30] | + | ? | ? | ? | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
Mike et al. [31] | + | ? | ? | ? | + | + | N.A. | + | + | + | + | + | + | + | N.A. | + | + | + | + | + | + | + |
Nesbit [32] | + | ? | ? | ? | ? | + | ? | + | + | + | + | + | + | + | ? | + | + | + | + | + | + | + |
Okun et al. [33] | + | ? | ? | ? | + | + | N.A. | + | + | + | + | + | + | + | N.A. | + | + | + | + | + | + | + |
Parkinson [34] | + | ? | – | ? | ? | + | ? | + | + | + | + | + | + | + | ? | + | + | + | + | + | + | + |
Pavlova & Silbereisen [35] | + | +/−d | ?e | −/+f | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
Pavlova & Silbereisen [36] | + | – | – | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
Son & Wilson [37] | + | + | – | ? | ? | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
Son & Wilson [38] | + | + | – | ? | ? | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
Son & Wilson [39] | + | + | – | ? | ? | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
Voorpostel & Coffé [40] | + | ? | – | ? | ? | + | ? | + | + | + | + | + | + | + | ? | + | + | + | + | + | + | + |
Voorpostel & Coffé [41] | + | ? | – | ? | ? | + | ? | + | + | + | + | + | + | + | ? | + | + | + | + | + | + | + |