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Table 1 Demographics of 2304 Chinese women by cervical histological examinationa

From: Dietary nutrient intake related to higher grade cervical intraepithelial neoplasia risk: a Chinese population-based study

Characteristics Total Without CINb CIN1 CIN2+c P valued
No. of participants (%) 2304 (100.0) 1503 (65.2) 564 (24.5) 237 (10.3)  
Age (years)      
 < 30 58 (2.5) 36 (2.4) 19 (3.4) 3 (1.3)  
 30–39 284 (12.3) 180 (12.0) 63 (11.1) 41 (17.3)  
 40–49 711 (30.9) 441 (29.3) 175 (31.0) 95 (40.1) 0.041
 50–59 970 (42.1) 666 (44.3) 231 (41.0) 73 (30.8)  
 > 60 281 (12.2) 180 (12.0) 76 (13.5) 25 (10.5)  
Education (years)      
 0–6 472 (20.5) 309 (20.6) 117 (20.7) 46 (19.4)  
 7–9 996 (43.2) 630 (41.9) 239 (42.4) 127 (53.6) 0.047
 > 9 836 (36.3) 564 (37.5) 208 (36.9) 64 (27.0)  
Yearly incomee (¥)      
 < 10,000 262 (11.4) 173 (11.5) 65 (11.5) 24 (10.1)  
 10,000–30,000 1119 (48.6) 738 (49.1) 255 (45.2) 126 (53.2) 0.763
 > 30,000 923 (40.1) 592 (39.3) 244 (43.3) 87 (36.7)  
Tobacco smoking 49 (2.1) 29 (1.9) 12 (2.1) 8 (3.4) 0.063
Menopause status 1174 (51.0) 803 (53.4) 293 (52.0) 78 (32.9) 0.001
High-risk HPVf      
 Positive 755 (32.8) 429 (28.5) 168 (29.8) 158 (66.7) < 0.001
 Negative 1549 (67.2) 1074 (71.5) 396 (70.2) 79 (33.3)  
Age at menarche (years)      
 < 13 308 (13.4) 181 (12.0) 93 (16.5) 34 (14.3)  
 13–< 15 739 (32.1) 466 (31.0) 180 (32.0) 93 (39.2) 0.028
 15–< 17 654 (28.4) 452 (30.1) 133 (23.6) 69 (29.1)  
 > 17 603 (26.2) 404 (26.9) 158 (28.0) 41 (17.3)  
IUDg use 1081 (46.9) 735 (48.9) 231 (41.0) 115 (48.5) 0.892
Years of IUD use (years)      
 < 10 1632 (70.8) 1037 (69.0) 426 (75.5) 169 (71.3) 0.287
 ≥ 10 672 (29.2) 466 (31.0) 138 (24.5) 68 (28.7)  
SCJh visibility      
 Fully visualized 646 (28.0) 382 (25.4) 185 (32.8) 79 (33.3) 0.114
 Not fully visualized 1658 (72.0) 1121 (74.6) 379 (67.2) 158 (66.7)  
Vaginal pH      
 < 4.5 514 (22.3) 341 (22.7) 106(18.8) 67 (28.3) 0.228
 ≥ 4.5 1790 (77.7) 1162 (77.3) 458 (81.2) 170 (71.7)  
Had gynecologic surgery 397 (17.2) 255 (17.0) 107 (19.0) 35 (14.8) 0.647
Had vaginitis 140 (6.1) 82 (5.5) 38 (6.7) 20 (8.4) 0.108
Sexual activity in menstrual period 56 (2.4) 39 (2.6) 9 (1.6) 8 (3.4) 0.549
  1. aData were presented as number (%) of participants
  2. bCIN, cervical intraepithelial neoplasia. All CIN status is by histology
  3. cCIN2+ included CIN 2, CIN 3 and SCC
  4. dP values for differences between groups were obtained from the chi-square test for categorical categoric variables
  5. eRepresent in terms of Chinese Renminbi (RMB)
  6. fHPV, human papilloma virus
  7. gIUD, intrauterine device
  8. hSCJ, squamous-columnar junction