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Table 3 Characteristics of main outcome domains in all 175 systematic reviews examined

From: Outcome choice and definition in systematic reviews leads to few eligible studies included in meta-analyses: a case study

Characteristic

Number of systematic reviews (N = 175) n (%)

Main outcome domain

 Visual acuity

55 (31)

 Intraocular pressure

11 (6)

 Visual field

7 (4)

 Visual impairment/vision loss

5 (3)

 Success of surgery/procedure

5 (3)

 Failure of trabeculectomy

4 (2)

 Progression of age-related macular degeneration

3 (2)

 Reading speed

3 (2)

 Ocular symptoms (unspecified)

3 (2)

 Symptoms of dry eye

3 (2)

 Vision-related quality of life

3 (2)

 Resolution of infection

3 (2)

 Active trachoma

3 (2)

 Healing of keratitis

3 (2)

 Other

64 (37)

Type of main outcome domain

 Categorical

122 (70)

 Continuous

50 (29)

 Other (i.e., time-to-event)

2 (1)

 Not reported

1 (0)

Goal of main outcome domain

 Efficacy

172 (98)

 Safety

3 (2)