Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

284 questions · 338 findings · 43 reviews

No studies found 22 · 6.5%GRADE not reported 138 · 40.8%Very low 76 · 22.5%Low 66 · 19.5%Moderate 31 · 9.2%High 5 · 1.5%

Higher total dose radiotherapy (76.8 Gy over 6.4 weeks) vs conventional dose RT

Locoregional control · People with primary squamous cell carcinoma of the oral cavity (ICD-O C01-C06) or oropharynx (ICD-O C09-C10); head and neck cancer trials…

Higher total dose radiotherapy (76.8 Gy over 6.4 weeks) showed no clear difference in locoregional control compared with conventional/standard total dose radiotherapy (72 Gy); GRADE not reported.

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Leaving the study early: insufficient response ‐ When compared with ultra low dose (<2 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) probably leads to lower leaving the study early: insufficient response ‐ When compared with… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Leaving the study early: insufficient response ‐ When compared with low dose (greater than or equal to 2‐<4 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) probably leads to lower leaving the study early: insufficient response ‐ When compared with… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Leaving the study early: insufficient response ‐ When compared with standard‐lower dose (greater than or equal to 4‐<6 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) showed no clear difference in leaving the study early: insufficient response ‐ When compared with… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Leaving the study early: insufficient response ‐ When compared with high dose (greater than or equal to 10 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) showed no clear difference in leaving the study early: insufficient response ‐ When compared with… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Global state: 1. No clinically important improvement ‐ CGI‐I ‐ when compared with low dose (greater than or equal to 2‐<4 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) probably leads to lower global state: 1. No clinically important improvement ‐ CGI‐I ‐ when… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Global state: 1. No clinically important improvement ‐ CGI‐I ‐ when compared with standard‐lower dose (greater than or equal to 4‐<6 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) showed no clear difference in global state: 1. No clinically important improvement ‐ CGI‐I ‐ when… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Global state: 1. No clinically important improvement ‐ CGI‐I ‐ when compared with high dose (greater than or equal to 10 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) showed no clear difference in global state: 1. No clinically important improvement ‐ CGI‐I ‐ when… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Mental state: No clinically important improvement · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) probably leads to lower mental state: 1. No clinically important improvement ‐ PANSS ‐ when… compared with ANY DOSE ‐ short term (moderate certainty).

4 findings from 1 review
Show 1 more finding

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Adverse effects: 6. Movement disorders ‐ specific symptoms ‐ EPS: unspecified ‐ versus low dose (greater than or equal to 2‐<4 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) showed no clear difference in adverse effects: EPS: unspecified ‐ Versus low dose (greater than or… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Adverse effects: 5a. Movement disorders ‐ specific symptoms ‐ EPS: unspecified ‐ versus standard‐lower dose (greater than or equal to 4‐<6 mg/day) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) showed no clear difference in adverse effects: EPS: unspecified ‐ Versus standard‐lower dose… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) vs ANY DOSE ‐ short term

Adverse effects: 5a. Movement disorders ‐ specific symptoms ‐ EPS: unspecified ‐ versus high dose ( greater than or equal to 10 mg) · patients with schizophrenia

STANDARD‐HIGHER DOSE (greater than or equal to 6‐<10 mg/day) probably leads to lower adverse effects: EPS: unspecified ‐ Versus high dose (greater than… compared with ANY DOSE ‐ short term (moderate certainty).

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Prostate cancer · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Prostate cancer: OR 1.04 (95% CI 0.98 to 1.09), not statistically significant. Umbrella review outcome-level evidence grade: Substantial effect unlikely.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Type 2 diabetes mellitus · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Type 2 diabetes: OR 0.63 (95% CI 0.56 to 0.69), statistically significant. Umbrella review outcome-level evidence grade: Suggestive.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Sporadic colorectal adenoma recurrence · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Sporadic colorectal adenoma recurrence: OR 0.87 (95% CI 0.57 to 1.33), not statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Ischaemic heart disease · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Ischaemic heart disease: HR 0.72 (95% CI 0.65 to 0.81), statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Breast cancer · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Breast cancer (Premenopausal): RR 1.01 (95% CI 0.97 to 1.06), not statistically significant. Umbrella review outcome-level evidence grade: Substantial effect unlikely.

3 findings from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

All cause mortality · people with chronic kidney disease (predialysis (GFR 15 to 60 mL/min/1.73 m²), HD, PD, transplant recipients)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for All cause mortality, Patients with chronic kidney disease: RR 0.86 (95% CI 0.81 to 0.92), statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Metabolic syndrome (prevalent) · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Metabolic syndrome (prevalent): OR 0.49 (95% CI 0.38 to 0.64), statistically significant. Umbrella review outcome-level evidence grade: Suggestive.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Cognitive function · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Cognition: OR 0.42 (95% CI 0.34 to 0.53), statistically significant. Umbrella review outcome-level evidence grade: Suggestive.

1 finding from 1 review