Findings

What do systematic reviews say?

40 questions · 40 findings · 2 reviews

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No studies found 8 · 20%GRADE not reported 13 · 32.5%Very low 14 · 35%Low 5 · 12.5%Moderate 0 · 0%High 0 · 0%

Preconception lifestyle advice on weight vs usual care or attention control

Reported behavioural changes in diet: fruit intake · women with infertility and obesity

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
1 study · 258 participants
Very low

Preconception lifestyle advice on weight vs usual care or attention control

Reported behavioural changes in alcohol intake · women with infertility and obesity

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
1 study · 239 participants
Very low

Preconception lifestyle advice on weight vs usual care or attention control

Reported behavioural changes in physical activity · women with infertility and obesity

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
1 study · 254 participants
Very low

Preconception lifestyle advice on weight vs usual care or attention control

Live birth · women with infertility and obesity

It is very uncertain whether preconception lifestyle advice on weight changes live birth compared with routine care or attention control (very low certainty).

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
RR 0.94 [0.62, 1.43]
2 studies · 707 participants
Very low

Preconception lifestyle advice on smoking vs usual care or attention control

Live birth or ongoing pregnancy · smoking people with infertility

The review found no eligible studies for this question.

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Preconception lifestyle advice on smoking vs usual care or attention control

Adverse events · smoking people with infertility

The review found no eligible studies for this question.

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Preconception lifestyle advice on smoking vs usual care or attention control

Miscarriage · smoking people with infertility

The review found no eligible studies for this question.

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Preconception lifestyle advice on smoking vs usual care or attention control

Reported behavioural changes in smoking (measured at 6 months): · smoking people with infertility

The review found no eligible studies for this question.

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Preconception lifestyle advice on alcohol intake vs usual care or attention control

Live birth · women with infertility and at‐risk drinking

It is very uncertain whether preconception lifestyle advice on alcohol intake changes live birth compared with routine care or attention control (very low certainty).

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
RR 1.15 [0.53, 2.5]
1 study · 37 participants
Very low

Preconception lifestyle advice on alcohol intake vs usual care or attention control

Adverse events · women with infertility and at‐risk drinking

The review found no eligible studies for this question.

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Preconception lifestyle advice on alcohol intake vs usual care or attention control

Miscarriage · women with infertility and at‐risk drinking

It is very uncertain whether preconception lifestyle advice on alcohol intake changes miscarriage compared with routine care or attention control (very low certainty).

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
RR 1.31 [0.21, 8.34]
1 study · 37 participants
Very low

Preconception lifestyle advice on alcohol intake vs usual care or attention control

Behavioural changes · women with infertility and at‐risk drinking

The review found no eligible studies for this question.

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Live birth · people with infertility

Preconception lifestyle advice on a combination of topics showed no clear difference in live birth compared with routine care or attention control (low certainty).

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
RR 0.93 [0.79, 1.1]
1 study · 626 participants
Low

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Adverse events · people with infertility

The review found no eligible studies for this question.

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Miscarriage · people with infertility

The review found no eligible studies for this question.

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Reported behavioural changes in weight: BMI (measured "at study end" ‐ 3 months) · people with infertility

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
1 study · 180 participants
Very low

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Reported behavioural changes in diet: vegetable intake · people with infertility

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
no estimate extracted
1 study · 264 participants
Very low

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Reported behavioural changes on vitamin or mineral supplement intake: number of women with adequate use of folic acid supplement · people with infertility

Preconception lifestyle advice on a combination of topics showed no clear difference in reported behavioural changes on vitamin or mineral supplement… compared with routine care or attention control (low certainty).

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
RR 0.98 [0.95, 1.01]
2 studies · 850 participants
Low

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Reported behavioural changes in alcohol intake · people with infertility

Preconception lifestyle advice on a combination of topics showed no clear difference in reported behavioural changes in alcohol intake (measured at 6 months) compared with routine care or attention control (low certainty).

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
RR 1.07 [0.99, 1.17]
1 study · 607 participants
Low

Preconception lifestyle advice on a combination of topics vs usual care or attention control

Reported behavioural changes in smoking (measured at 6 months): · people with infertility

Preconception lifestyle advice on a combination of topics showed no clear difference in reported behavioural changes in smoking (measured at 6 months): compared with routine care or attention control (low certainty).

1 finding from 1 review

Preconception lifestyle advice for people with infertility 2021 · Cochrane Headline outcomes only
RR 1.01 [0.98, 1.04]
1 study · 606 participants
Low