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Table 1 Basic demographic characteristics of the participants (N = 964 males and 922 females)

From: Perfluoroalkyl and polyfluoroalkyl substance exposure and association with sex hormone concentrations: results from the NHANES 2015–2016

  Female (%/P25, P75) Male (%/P25, P75) Total (%/P25, P75)
Age    
 12–19 136 (14.75) 194 (20.12) 330 (17.50)
 20–49 394 (42.73) 391 (40.56) 785 (41.62)
  ≥ 50 392 (42.52) 379 (39.32) 771 (40.88)
Menstrual age 12.63 ± 1.79
 BMI    
 < 18.5 21 (2.28) 44 (4.56) 65 (3.45)
 18.5–24.9 260 (28.20) 288 (29.88) 548 (29.06)
 > 24.9 641 (69.52) 632 (65.56) 1273 (67.50)
Race    
 Mexican American 185 (20.07) 175 (18.15) 360 (19.09)
 Other Hispanic 126 (13.67) 116 (12.03) 242 (12.83)
 Non-Hispanic White 273 (29.61) 322 (33.40) 595 (31.55)
 Non-Hispanic Black 221 (23.97) 194 (20.12) 415 (22.00)
 Other Race 117 (12.69) 157 (16.29) 274 (14.53)
Education    
 Less than 9th grade 156 (17.35) 198 (21.27) 354 (19.34)
 9–11th grade 125 (13.90) 150 (16.11) 275 (15.03)
 High school graduate 168 (18.69) 174 (18.69) 342 (18.69)
 Some college/AA degree 261 (29.03) 229 (24.60) 490 (26.78)
 College graduate 189 (21.02) 180 (19.33) 369 (20.16)
Ratio of family income to poverty    
 Under standard 704 (76.36) 726 (75.31) 1430 (75.82)
 Above standard 218 (23.64) 238 (24.69) 456 (24.18)
Ever taken birth control pills    
 Yes 550 (59.65)
 No 372 (40.35)
 Cotinine (ng/mL) 0.03 (0.01,0.22) 0.05 (0.01,26.20) 0.03 (0.01,2.15)
 TT (ng/dL) 20.45 (14.10,29.30) 392.00 (285.00,517.00) 120.00 (20.50,396.00)
 E (pg/mL) 24.75 (6.44,84.50) 23.20 (17.80,30.20) 23.60 (13.00,37.80)
 SHBG (nmol/L) 60.50 (39.96,90.49) 38.32 (26.95,54.48) 46.61 (32.36,71.47)
 FT (ng/dL) 0.23 (0.15,0.36) 6.91 (5.05,9.03) 1.33 (0.23,6.95)