Table 1.
Characteristics of eligible studies.
| Variable | Number of studies (percentage based on column total) | ||||
|
|
LRa (n=77), n (%) | Non-LR (n=50), n (%) | Both (n=15), n (%) | Total (n=142), n (%) | |
| Population | |||||
|
|
Pregnant women | 50 (65) | 11 (22) | 6 (40) | 67 (47.2) |
|
|
Fetuses or newborns | 19 (25) | 26 (52) | 7 (47) | 52 (36.6) |
|
|
Men or women in procreative management | 8 (10) | 13 (26) | 2 (13) | 23 (16.2) |
| Study design | |||||
|
|
Retrospective | 53 (69) | 27 (54) | 9 (60) | 89 (62.7) |
|
|
Nested case-control | 4 (5) | 14 (28) | 2 (13) | 20 (14.1) |
|
|
Prospective | 13 (17) | 4 (8) | 0 (0) | 17 (12) |
|
|
Cross-sectional | 3 (4) | 3 (6) | 3 (20) | 9 (6.3) |
|
|
Case-control | 4 (5) | 2 (4) | 1 (7) | 7 (4.9) |
| Timing | |||||
|
|
At delivery | 28 (36) | 26 (52) | 7 (46.7) | 61 (42.9) |
|
|
At pregnancy | 34 (44) | 21 (42) | 5 (33.3) | 60 (42.3) |
|
|
Mixed timing | 13 (17) | 0 (0) | 1 (6.7) | 14 (9.9) |
|
|
Puerperal or neonatal period | 2 (3) | 3 (6) | 2 (13.3) | 7 (4.9) |
| Setting | |||||
|
|
Hospital | 61 (79) | 43 (86) | 9 (60) | 113 (79.6) |
|
|
Both | 10 (13) | 1 (2) | 5 (33) | 16 (11.3) |
|
|
Primary care | 6 (8) | 6 (12) | 1 (7) | 13 (9.2) |
aLR: logistic regression.