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Table 1 Demographic characteristics of GERD and non-GERD groups after propensity score matching n(%)

From: Gastroesophageal reflux disease and its related factors among women of reproductive age: Korea Nurses’ Health Study

Variables GERD
(n = 1184)
Non-GERD
(n = 1184)
Total
(N = 2368)
t2 p-value
Age (years)
 ≤ 29 433 (36.6) 426 (36.0) 859 (36.3) .11 .949
 30–39 505 (42.6) 512 (43.2) 1017 (42.9)   
 ≥ 40 246 (20.8) 246 (20.8) 492 (20.8)   
Educational status
 3-year college 533 (45.0) 506 (42.7) 1039 (43.9) 1.28 .528
 4-year college 538 (45.5) 558 (47.1) 1096 (46.3)   
 Master’s degree or higher 113 (9.5) 120 (10.2) 233 (9.8)   
Marital status
 Single 732 (61.8) 728 (61.5) 1460 (61.7) .03 .986
 Married 443 (37.4) 447 (37.7) 890 (37.5)   
 Divorced or widowed 9 (.8) 9 (.8) 18 (.8)   
Annual income (USD)
 ≤ 20,000 35 (3.0) 24 (2.0) 59 (2.5) 3.29 .511
 20,000–29,999 445 (37.6) 440 (37.2) 885 (37.3)   
 30,000–39,999 439 (37.1) 436 (36.8) 875 (37.0)   
 40,000–49,999 158 (13.3) 178 (15.0) 336 (14.2)   
 ≥ 50,000 107 (9.0) 106 (9.0) 213 (9.0)   
Work schedule
 Non-rotating (no night shift) 368 (31.1) 350 (29.6) 718 (30.3) .65 .421
 Rotating with night shift 816 (68.9) 834 (70.4) 1650 (69.7)   
  1. Note: GERD gastroesophageal reflux disease