Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

513 questions · 560 findings · 38 reviews · Headline outcomes only

No studies found 107 · 19.1%GRADE not reported 10 · 1.8%Very low 168 · 30%Low 146 · 26.1%Moderate 107 · 19.1%High 22 · 3.9%

Budesonide 6 mg vs budesonide

Remission · Participants with Crohn's disease in remission

Budesonide 6 mg showed no clear difference in continued remission at 3 months compared with budesonide 3 mg (moderate certainty).

3 findings from 1 review

Methotrexate vs placebo

Failure to enter remission or possible remission at 16 weeks (Arora 1999) · adult patients with refractory Crohn's disease

Methotrexate showed no clear difference in failure to enter remission or possible remission at 16 weeks (Arora… compared with placebo (low certainty).

3 findings from 1 review

Methotrexate vs 6‐MP or azathioprine

Withdrawals due to adverse events · adult patients with refractory Crohn's disease

It is very uncertain whether methotrexate changes withdrawal due to adverse event (Oren 1997) compared with 6‐MP or azathioprine (very low certainty).

3 findings from 1 review

Methotrexate vs 5‐aminosalicylic acid (5‐ASA) (mesalazine)

Failure to enter remission or possible remission at 16 weeks (Arora 1999) · adult patients with refractory Crohn's disease

It is very uncertain whether methotrexate changes failure to enter remission or possible remission at 30 weeks… compared with 5‐ASA (very low certainty).

1 finding from 1 review

Methotrexate + infliximab vs infliximab

Failure to enter remission at 14 weeks or 24 weeks (Feagan 2014) · adult patients with refractory Crohn's disease

Methotrexate + infliximab showed no clear difference in failure to enter remission at 14 weeks or 24 weeks (Feagan 2014) compared with infliximab alone (low certainty).

2 findings from 1 review

Methotrexate vs placebo

Withdrawals due to adverse events · adult patients with refractory Crohn's disease

Methotrexate may leads to higher withdrawal due to adverse event (Feagan 1995) compared with placebo (low certainty).

3 findings from 1 review

Methotrexate vs 6‐MP or azathioprine

Failure to enter remission or possible remission at 16 weeks (Arora 1999) · adult patients with refractory Crohn's disease

Methotrexate showed no clear difference in failure to enter remission or possible remission at 24‐36 weeks… compared with 6‐MP or azathioprine (low certainty).

3 findings from 1 review

Intervention not reported

Relapse rate at one year (all studies) · Crohn's disease patients in remission

It is very uncertain whether the intervention changes relapse rate at one year (all studies) (very low certainty).

1 finding from 1 review

Intervention not reported

Relapse rate at one year (sensitivity analysis of Belluzi 1996) · Crohn's disease patients in remission

It is very uncertain whether the intervention changes relapse rate at one year (sensitivity analysis of Belluzi 1996) (very low certainty).

1 finding from 1 review

Intervention not reported

Relapse rate at one year (only EPIC studies) · Crohn's disease patients in remission

The intervention showed no clear difference in relapse rate at one year (only EPIC studies) (moderate certainty).

1 finding from 1 review

Intervention not reported

Adverse events rate‐ Upper GI (nausea, vomiting, halitosis, heartburn, dyspepsia, dysgeusia and bloating) · Crohn's disease patients in remission

The intervention probably leads to higher adverse events rate‐ Upper GI (nausea, vomiting, halitosis,… (moderate certainty).

1 finding from 1 review

Methotrexate vs placebo

Maintenance of clinical remission · Participants with Crohn's disease in remission

Methotrexate probably leads to higher proportion of patients maintaining clinical remission compared with placebo (moderate certainty).

3 findings from 1 review