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Table 2 Between-group and within-group comparison of preoperative and postoperative IOP

From: Phaco-UCP; combined phacoemulsification and ultrasound ciliary plasty versus phacoemulsification alone for management of coexisting cataract and open angle glaucoma: a randomized clinical trial

Timepoints IOP (mmHg); Median (Q1, Q3)
Study group
(n=31)
Control group
(n=30)
P 1
Baseline (preoperative) 24 (22, 28) 24 (22, 25) 0.3
1 day postoperative 8 (6, 9) 10 (9, 12) <0.001
1 Week 10 (8,11) 13 (11, 18) <0.001
1 Month 13 (12,15) 17 (14, 22) <0.001
3 Months 16 (14,20) 22 (17, 24) <0.001
6 Months 18 (14, 19) 22 (16, 23) <0.001
12 Months 16 (13, 19) 21 (17, 23) <0.001
18 Months 17 (15, 19) 21 (18, 23) <0.001
P2 <0.001 <0.001  
P3 <0.001 <0.001  
  1. IOP Intraocular pressure, Q1 1st quartile, Q3 3rd quartile
  2. P 1: Mann-Whitney U test between the study and control groups at each time point
  3. P 2: Freidman test between median IOP at baseline and at different time points postoperative within each group
  4. P 3: Wilcoxon Signed Ranks test between median IOP at baseline and at 18th month postoperative within each group
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