Table 1

Summary statistics of baseline predictors and follow-up data for OHTS and EGPS, where categorical variables are summarized as counts and proportions, while the continuous variables are summarized in means and standard deviations (SD).
Variables OHTS (N = 1600) EGPS (N = 971)
Baseline predictors
TRT 795 (49.7%) 487 (50.2%)
Male 687 (42.9%) 445 (45.8%)
Black 396 (24.8%) 1 (0.1%)
AGE (decades) 5.56 (0.96) 5.70 (1.02)
IOP0 (mmHg) 24.9 (2.69) 23.4 (1.62)
CCT (μm) 572.6 (38.5) 573.3 (37.5)
PSD (dB) 1.91 (0.21) 2.00 (0.52)
VCD 0.39 (0.19) 0.32 (0.14)
BB 71 (4.4%) 64 (6.6%)
CHB 190 (11.9%) 66 (6.8%)
DM 188 (11.8%) 55 (5.7%)
Heart 99 (6.2%) 109 (11.2%)
HBP 606 (37.9%) 279 (28.7%)
Post-randomization IOP
Mean (mmHg) 21.44 (3.45) 19.73 (2.57)
SD (mmHg) 2.27 (1.04) 2.22 (1.03)
Median #visits (min-max) 13 (2–16) 9 (2–10)
POAG 146 (9.1%) 107 (11.0%)

Gao et al.

Gao et al. BMC Medical Research Methodology 2012 12:151   doi:10.1186/1471-2288-12-151

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