Table 2

Prevalence of idiopathic and secondary ERMs by age and gender in the Jiangning Eye Study

Age groups (years)All ages
50–59 case (%)60–69 case (%)70–79 case (%)80+ case (%)p for age trendMales case (%)Females case (%)Total case (%)
All ERMn=757n=672n=355n=221n=877n=1128n=2005
 CMR11 (1.5)35 (5.2)31 (8.7)24 (10.9)<0.00131 (3.5)70 (6.2)101 (5.0)
2.8 (1.7–3.9)*5.7 (4.4–7.1)*4.3 (3.4–5.2)*
 PMF12 (1.6)31 (4.6)14 (3.9)11 (5.0)0.00527 (3.1)41 (3.6)68 (3.4)
2.6 (1.5–3.7)*3.5 (2.4–4.5)*3.0 (2.3–3.8)*
 Any ERM signs23 (3.0)66 (9.8)45 (12.6)35 (15.8)<0.00158 (6.6)111 (9.8)169 (8.4)
5.4 (3.9–6.9)*9.2 (7.5–10.9)*7.3 (6.2–8.5)*
Idiopathic ERMn=742n=630n=311n=171n=805n=1049n=1854
 CMR11 (1.5)29 (4.6)26 (8.4)19 (11.1)<0.00126 (3.2)59 (5.6)85 (4.6)
 PMF12 (1.6)28 (4.4)11 (3.5)7 (4.1)0.02922 (2.7)36 (3.4)58 (3.1)
 Any ERM signs23 (3.1)57 (9.0)37 (11.9)26 (15.2)<0.00148 (6.0)95 (9.1)143 (7.7)
Secondary ERM†n=15n=42n=44n=50n=72n=79n=151
 CMR06 (14.3)5 (11.4)5 (10.0)NA5 (6.9)11 (13.9)16 (10.6)
 PMF03 (7.1)3 (6.8)4 (8.0)NA5 (6.9)5 (6.3)10 (6.6)
 Any ERM signs09 (21.4)8 (18.2)9 (18.0)NA10 (13.2)16 (20.3)26 (17.2)
  • *Standardised by the age and gender to the 2010 Chinese census population.

  • †Secondary ERM was defined as having ERM in eyes with retinal vein occlusion, diabetic retinopathy, late age-related macular degeneration, retinal detachment, or history of cataract surgery.

  • CMR, cellophane macular reflex; ERM, epiretinal membrane; NA, not available; PMF, preretinal macular fibrosis.