TTP distributions for each exposure category: short term exposure model
| Time period | External control (n=236) | Internal control (n=230) | <20 μg/dl (n=71) | 20–29 μg/dl (n=156) | 30–39 μg/dl (n=162) | 40+ μg/dl (n=184) | Missing (n=65) | Total (n=1104) |
|---|---|---|---|---|---|---|---|---|
| The values given are the number becoming pregnant in that interval (in parentheses: cumulative percentages of those pregnant up to the end of the current interval), grouped for convenience. | ||||||||
| 1 month | 66 (28) | 111 (48) | 35 (49) | 78 (50) | 84 (52) | 81 (44) | 21 (32) | 476 (43) |
| 2 months | 43 (46) | 35 (64) | 14 (69) | 32 (71) | 17 (62) | 25 (58) | 12 (51) | 178 (59) |
| 3 months | 32 (60) | 25 (74) | 9 (82) | 11 (78) | 20 (75) | 18 (67) | 8 (63) | 123 (70) |
| 4–6 months | 43 (78) | 27 (86) | 6 (90) | 12 (85) | 14 (83) | 30 (84) | 9 (77) | 141 (83) |
| 7–9 months | 10 (82) | 8 (90) | 1 (92) | 5 (89) | 5 (87) | 6 (87) | 2 (80) | 37 (87) |
| 10–12 months | 19 (90) | 9 (94) | 3 (96) | 11 (96) | 4 (89) | 7 (91) | 4 (86) | 57 (92) |
| 13+ months | 23 (100) | 15 (100) | 3 (100) | 7 (100) | 18 (100) | 17 (100) | 9 (100) | 92 (100) |