Table 1 Characteristics of intervention and comparison eye cohorts immediately prior to phacoemulsification and at ‘time zero’ respectively.

From: An observational clinical study of the influence of phacoemulsification on choroidal neovascular membrane activity in age related macular degeneration

Baseline variable

Intervention cohort n = 327

Comparison cohort n = 327

p value

Age; median (IQR)

83 (79–87)

83 (79–87)

0.579

VA in ETDRS letters; median (IQR)

50 (35–65)

64 (44–72)

<0.001*

Months since first IVI; median (IQR)

32 (21–56)

33 (21–57)

0.886

Months since most recent IVI; median (IQR)

2 (1–5)

2 (1–7)

0.206

Total IVIs in prior 6 months; median (IQR)

2 (1–3)

2 (0–3)

0.3

Female; count (%)

224 (68.5)

230 (70.3)

0.611

Right eyes; count (%)

169 (51.7)

165 (50.5)

0.754

  1. Independent Mann–Whitney U tests and Chi-squared tests were used to check for significant differences between the continuous and categorical variables respectively with an * denoting significance following Bonferroni adjustment for the 7 tests (p < 0.007 taken as significant). IQR = interquartile range, VA = visual acuity, IVI = intravitreal injection, ETDRS = Early Treatment of Diabetic Retinopathy Study.
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