Table 1

Demographic and clinical characteristics in women aged 20–49 years with anaemia who were tested for iron deficiency

CharacteristicsEntire cohort
n=9783 (100)
Iron deficiency
n (%)
Had endoscopy*
n (%)
Yes (n=6627)No (n=3156)Yes (n=653)No (n=9130)
Iron deficiency7919 (65.5)527 (80.70%)6100 (66.81%)
Had endoscopy*1036 (8.6)527 (7.95)126 (3.99)
Age groups (year)
 20–29648 (5.4)379 (5.72)269 (8.52)15 (2.30)633 (6.93)
 30–392591 (21.4)1656 (24.99)935 (29.63)118 (18.07)2473 (27.09)
 40–496544 (54.2)4592 (69.29)1952 (61.85)520 (79.63)6024 (65.98)
Age (year), mean±SD43.1±7.3
Charlson comorbidity index score0.5±0.90.9±1.40.9±1.50.6±1.1
 Mean±SD0.7±1.22134 (32.2)1367 (43.31)282 (43.19)3219 (35.26)
 ≥14568 (37.8)379 (5.72)269 (8.52)15 (2.30)633 (6.93)
Race/ethnicity
 White3686 (30.5)1886 (28.46)865 (27.41)228 (34.92)2523 (27.63)
 Black2397 (19.8)1178 (17.78)793 (25.13)95 (14.55)1876 (20.55)
 Hispanic2480 (7.8)1660 (25.05)466 (14.77)164 (25.11)1962 (21.49)
 Asian2574 (21.3)1417 (21.38)754 (23.89)114 (17.46)2057 (22.53)
 Other†947 (7.8)486 (7.33)278 (8.81)52 (796)712 (7.80)
Any comorbidity3292 (27.2)1661 (25.06)826 (26.17)172 (26.34)2315 (25.36)
 Diabetes mellitus1304 (10.8)548 (8.27)376 (11.91)72 (11.03)852 (9.33)
 Kidney disease333 (2.8)66 (1.00)162 (5.13)21 (3.22)207 (2.27)
 Cardiovascular disease238 (2.0)63 (0.95)72 (2.28)13 (1.99)12 (1.34)
 Pulmonary disease330 (2.7)140 (2.11)115 (3.64)17 (2.60)238 (2.61)
 Menorrhagia1712 (14.2)1059 (15.98)286 (9.06)87 (13.32)1258 (13.78)
 Cirrhosis40 (0.3)10 (0.15)17 (0.54)9 (1.38)18 (0.20)
Any symptoms6372 (52.7)3411 (51.47)1667 (52.82)506 (77.49)4572 (50.08)
 UGI symptoms4688 (38.8)2504 (37.78)1201 (38.05)424 (64.93)3281 (35.94)
 Dysphagia390 (3.2)183 (2.76)103 (3.26)44 (6.74)242 (2.65)
 LGI symptoms3060 (25.3)1622 (24.48)849 (26.90)251 (38.44)2220 (24.32)
 Rectal bleed710 (5.9)402 (6.07)175 (5.54)82 (12.56)495 (5.42)
 Weight loss291 (2.4)135 (2.04)85 (2.69)28 (4.29)192 (2.10)
Any gastric symptoms: UGI and/or dysphagia3705 (37.9)2504 (37.8)1201 (38.1)424 (64.9)3281 (35.9)
Any colon symptoms: LGI and/or rectal bleed2471 (25.3)1622 (24.5)849 (26.9)251 (38.4)2220 (24.3)
Endoscopy within 5 years of study entry1498 (15.3)1101 (16.6)397 (12.6)653 (100)845 (9.3)
  • Data are column % unless otherwise stated.

  • –, not applicable.

  • *Defined as undergoing endoscopy within 1 year of the iron deficiency test date.

  • †Including American Indians, Alaskan Natives, more than one racial groups and unknown.

  • LGI, lower gastrointestinal; UGI, upper gastrointestinal.