Table A1.
Various exposure windows examined by reviewed articles.
| Exposure Window | Number of Studies |
|---|---|
| Same day (Lag 0) | 18 |
| 1 day before the case (Lag 0–1) | 12 |
| 2 days before the case (Lag 0–2) | 14 |
| 3 days before the case (Lag 0–3) | 11 |
| 4 days before the case (Lag 0–4) | 11 |
| 5 days before the case (Lag 0–5) | 10 |
| 6days before the case (Lag 0–6) | 10 |
| Last week of pregnancy (Lag 0–7) | 21 |
| 2 weeks before delivery (Lag 0–14) | 4 |
| 3 weeks before delivery (0–21) | 3 |
| Last month of pregnancy (lag 0–28) | 16 |
| 1st trimester | 22 |
| 2nd trimester | 23 |
| 3rd trimester | 21 |
| Entire pregnancy | 19 |
| Pre–conception(3 months prior to LMP) | 8 |
| 1month prior to LMP | 1 |
| Conception date | 1 |
| 0–8 weeks of pregnancy | 1 |
| Week 1 (0–7days) of gestation | 2 |
| Weeks 2–8 | 1 |
| Weeks 3–4 | 1 |
| Weeks 3–8 | 2 |
| Weeks 8–14 | 1 |
| 1st month of gestation | 6 |
| 2nd month of gestation | 2 |
| 3rd month of gestation | 2 |
| Gestation week 20 to birth | 1 |
| 0–36 weeks | 2 |
| Gestation week 22–26 | 1 |
| Gestation week 27–29 | 1 |
| Gestation week 30–32 | 1 |
| Gestation week 33–35 | 1 |
| Gestation week 36 | 1 |
| Gestation week 37–38 | 1 |
| Gestation week 39–43 | 1 |
| 0–28days after birth | 3 |
| Not stated | 1 |
Note: Some studies examined more than one exposure window. LMP: last menstrual period.