Time to pregnancy – RCTs (follow-up: 2 cycles) |
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21,2 | randomized trials | seriousa,b | not serious | not serious | not serious | publication bias strongly suspectedc | There was no evidence of difference in time-to-pregnancy (indicated by positive pregnancy test) in either study. In one study, 46 of 500 participants in the OPK group (9.2%) became pregnant during the 1st menstrual cycle, compared with 27 of 500 (5.4%) in control group; during the 2nd cycle, another 23 in the OPK group became pregnant (cumulatively 22.8%) and another 23 in the control group (cumulatively 10%).2 The other study found pregnancies among women before the 1st menstrual cycle (22 of 87 in the OPK group compared with 13 of 68 in the control group); after the 1st cycle, 30 of 55 women using OPKs were found pregnant compared with 9 of 54 in the control group; and after the 2nd cycle, 7 of 44 women using OPKs were found pregnant compared with 6 of 43 in the control group.1 Pre-cycle 1 pregnancies were included in this study, as participants were sent study materials after recruitment and randomization and may have become pregnant by the 1st timepoint (day 6 of cycle 1).d | ⨂⨂◯◯ LOW | critical |
Pregnancy (clinical and self-reported) – RCTs (follow-up: range 2–3 cycles) |
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31,2,3 | randomized trials | seriousa,b | not serious | not serious | not serious | publication bias strongly suspectedc | 129/695 (18.6%) | 89/675 (13.2%) | RR 1.36 (1.07 to 1.73) | 47 more per 1000 (from 9 more to 96 more) | ⨂⨂◯◯ LOW | critical |
Pregnancy (clinical only) – RCTs (follow-up: 3 cycles) |
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13 | randomized trials | not serious | not seriouse | seriousf | seriousg | publication bias strongly suspectedc | 12/80 (15.0%) | 11/80 (13.8%) | RR 1.09 (0.51–2.32) | 11 more per 1000 (from 69 fewer to 182 more) | ⨂◯◯◯ VERY LOW | critical |
Pregnancy (self-reported only) – RCTs (follow-up: 2 cycles) |
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21,2 | randomized trials | seriousa,b | not serious | not serious | not serious | publication bias strongly suspectedc | 117/615 (19.0%) | 78/595 (13.1%) | RR 1.40 (1.08 to 1.80) | 52 more per 1000 (from 10 more to 105 more) | ⨂⨂◯◯ LOW | critical |
Pregnancy (clinical only) – observational study (follow-up: 6 cycles) |
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14 | observational studies | not serious | not seriouse | serioush | not serious | publication bias strongly suspectedpc | 6/64 (9.4%) | 14/53 (26.4%) | RR 0.35 (0.15 to 0.86) | 172 fewer per 1000 (from 225 fewer to 37 fewer) | ⨂◯◯◯ VERY LOW | critical |
Stress (PSS, higher scores indicate higher stress) – RCTs (follow-up: 2 cycles) |
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11 | randomized trials | seriousb | not seriouse | not serious | not seriousi | publication bias strongly suspectedc | OPK Mean: 17.76, SD: 6.48, Total: 37; Control Mean: 15.78, SD: 6.25, Total: 40; Mean difference: 1.98, 95% CI: −0.91 to 4.87, P-value: 0.18 | ⨂⨂◯◯ LOW | critical |
Stress (PANAS positive affect, higher scores indicate stronger positive emotion) – RCTs (follow-up: 2 cycles) |
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11 | randomized trials | seriousb | not seriouse | not serious | not seriousj | publication bias strongly suspectedc | OPK Mean: 29.75, SD: 10.24, Total: 36; Control Mean: 34.26, SD: 8.06, Total: 38; Mean difference: −4.51, 95% CI: −8.77 to −0.25, P-value: 0.04 | ⨂⨂◯◯ LOW | critical |
Stress (PANAS negative affect, higher scores indicate stronger negative emotion) – RCTs (follow-up: 2 months) |
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11 | randomized trials | seriousb | not seriouse | not serious | seriousk | publication bias strongly suspectedc | OPK Mean: 17.55, SD: 6.97, Total: 38; Control Mean: 16.9, SD: 6.64, Total: 40; Mean difference: 0.65, 95% CI: −2.42 to 3.72, P-value: 0.67 | ⨂◯◯◯ VERY LOW | critical |
Stress (SF-12 physical, higher scores indicate better health-related quality of life) – RCTs (follow-up: 2 cycles) |
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11 | randomized trials | seriousb | not seriouse | not serious | seriousl | publication bias strongly suspectedc | OPK Mean: 41.86, SD: 4, Total: 38; Control Mean: 41.12, SD: 3.14, Total: 40; Mean difference: 0.74, 95% CI: −0.88 to 2.36, P-value: 0.37 | ⨂◯◯◯ VERY LOW | critical |
Stress (SF-12 mental, higher scores indicate better health-related quality of life) – RCTs (follow-up: 2 cycles) |
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11 | randomized trials | seriousb | not seriouse | not serious | seriousm | publication bias strongly suspectedc | OPK Mean: 46.40, SD: 7.15, Total: 38; Control Mean: 46.15, SD: 5.11, Total: 40; Mean difference: 0.25, 95% CI: −2.54 to 3.04, P-value: 0.86 | ⨂◯◯◯ VERY LOW | critical |
Stress (cortisol: creatinine ratio, higher ratio indicates higher stress) – RCTs (follow-up: 2 cycles) |
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11 | randomized trials | seriousb | not seriouse | not serious | seriousn | publication bias strongly suspectedc | OPK Mean: 139.30, SD: 59.03, Total: 37; Control Mean: 156.23, SD: 89.44, Total: 38; Mean difference: −16.9, 95% CI: −51.87 to 18.07, P-value: 0.34 | ⨂◯◯◯ VERY LOW | critical |
Stress (estrone-3-glucuronide [E3G]: creatinine ratio, higher ratio indicates higher depression/anxiety) – RCTs (follow-up: 2 cycles) |
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11 | randomized trials | seriousb | not seriouse | not serious | seriouso | publication bias strongly suspectedc | OPK Mean: 101.59, SD: 52.34, Total: 37; Control Mean: 95.24, SD: 52.43, Total: 38; Mean difference: 6.35, 95% CI: −17.76 to 30.46, P-value: 0.60 | ⨂◯◯◯ VERY LOW | critical |
Live birth – not reported |
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Social harms/adverse events – not reported |
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