Table 3. Characteristics of Exposures and Data Sources of the Studies.
| Case-Crossover(n = 50) | Self-controlled case series(n = 45) | All Articles(n = 93)a | ||
| No.(%) | No.(%) | No.(%) | ||
| Exposures | ||||
| Vaccines | 3 (6) | 34 (76) | 36 (39)a | |
| Other medication | 44 (88) | 11 (24) | 54 (58) | |
| Medical device (gloves, condom) | 3 (6) | 0 | 3 (3) | |
| Data sources | ||||
| Sources of exposure data | ||||
| Administrative database b | 37 (74) | 34 (76) | 69 (74)a | |
| Data collected for the study c | 13 (26) | 4 (9) | 17 (19) | |
| Pre-existing studiesd | 6 (12) | 3 (7) | 9 (10) | |
| Sources of events data collection | ||||
| Administrative database b | 39 (78) | 41 (91) | 78 (84)a | |
| Data collected for the study c | 3 (6) | 1 (2) | 4 (4) | |
| Pre-existing studiesd | 12 (24) | 4 (9) | 16 (17) | |
| Events and exposures data resulted from administrative databases | 33 (66) | 33 (73) | 64 (69)a | |
a
Two reports used both CC and SCCS.
b
Administrative database: reimbursement database, hospital or institutional records, primary care database (THIN, GRPD).
c
Data collected for the study: self-questionnaire, diary, telephone call, web site, interview, individual health booklet.
d
Pre-existing studies: register, clinical/cohort data.