Table 2

Distribution of prognostic factors in the two treatment groups: extracapsular cataract extraction without phacoemulsification (ECCE, n=236) and with phacoemulsification (Phako, n=246). Percentages are of the total number in the treatment group

 Characteristics at baseline (before surgery)Treatment groupsTreatment groups
ECCE
No (%)
Phako
No (%)
ECCE
Mean (SE)
Phako
Mean (SE)
Age 72.3  (0.6)71.1  (0.6)
Sex:
 Females129  (55)147  (60)
Ethnic group:
 White213 (90)237 (96)
 Asian10 (4)5 (2)
 African-Caribbean4 (2)13 (6)
Previous cataract surgery in fellow eye65 (28)87 (35)
Hypertension 31 (13)40 (16)
Lens brunescence grade III–IV 123 (52)113 (46)
Study centre:
 Oxford95 (40)99 (40)
 London141 (60)147 (60)
Surgeon:
 A95 (40)99 (40)
 B51 (22)50 (20)
 C41 (17)47 (19)
 D17 (7)16 (7)
 E14 (6)16 (7)
 F7 (3)10 (4)
 G6 (3)5 (2)
 H5 (2)3 (1)
Admission:
 Day case174 (74)195 (79)
 Inpatient62 (26)51 (21)
Axial length of the eye (mm)23.4  (0.1)23.3  (0.1)
Corneal endothelia cell count (in 100s)24.9 (2.5)24.6 (2.6)
Corneal thickness (mm)0.5 (0.003)0.5 (0.003)
Unaided visual acuity (logMAR)1.0 (0.03)1.1 (0.03)
  • Factor adjusted for in multiple regression analyses, and assessed as possible “effect modifier.”