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Table 1 Characteristics in the study and control groups at baseline

From: Risk factors for the occurrence of visual-threatening posterior capsule opacification

  Control n = 17,142 Nd:YAG capsulotomy n = 8571 P value
Age at baseline, mean ± SD 72.17 ± 8.74 72.17 ± 8.74 1.0000
 < 40 6 (0.04%) 3 (0.04%)  
 40–59 1552 (9.05%) 776 (9.05%)  
 60–79 12,030 (70.18%) 6015 (70.18%)  
 ≥ 80 3554 (20.73%) 1777 (20.73%)  
Gender    1.0000
 Female 9608 (56.05%) 4804 (56.05%)  
 Male 7534 (43.95%) 3767 (43.95%)  
Urbanization    < 0.0001
 Urban 8921 (52.04%) 4702 (54.86%)  
 Sub-urban 5331 (31.1%) 2620 (30.57%)  
 Rural 2890 (16.86%) 1249 (14.57%)  
Low income 84 (0.49%) 34 (0.40%) 0.2965
Co-morbidities
 Corneal disease 1674 (9.77%) 868 (10.13%) 0.3597
 DED 1783 (10.4%) 1010 (11.78%) 0.0008
 Glaucoma 1768 (10.31%) 1078 (12.58%) < 0.0001
 Uveitis 180 (1.05%) 115 (1.34%) 0.0384
 AMD 876 (5.11%) 510 (5.95%) 0.0049
 Hypertension 9585 (55.92%) 4769 (55.64%) 0.6764
 DM 5138 (29.97%) 2449 (28.57%) 0.0203
 Hyperlipidemia 4739 (27.65%) 2516 (29.35%) 0.0041
 Congestive heart failure 1462 (8.53%) 738 (8.61%) 0.8253
 Myocardial infarction 308 (1.8%) 145 (1.69%) 0.5463
 Cerebrovascular disease 2414 (14.08%) 1215 (14.18%) 0.8394
 Peripheral vascular disease 833 (4.86%) 435 (5.08%) 0.4511
 Dementia 408 (2.38%) 161 (1.88%) 0.0099
 Chronic pulmonary disease 4363 (25.45%) 2231 (26.03%) 0.3174
 Rheumatic disease 470 (2.74%) 241 (2.81%) 0.7469
 Peptic ulcer disease 4274 (24.93%) 2375 (27.71%) < 0.0001
 Liver disease 2830 (16.51%) 1517 (17.7%) 0.0164
 Hemiplegia or paraplegia 347 (2.02%) 146 (1.7%) 0.0770
 Renal disease 1470 (8.58%) 665 (7.76%) 0.0253
 Malignancy including lymphoma 1084 (6.32%) 540 (6.3%) 0.9422
 Coagulation defects 28 (0.16%) 12 (0.14%) 0.6545
  1. SD standard deviation, DED dry eye disease, AMD age-related macular degeneration, DM diabetes mellitus