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Table 2 Individual demographic characteristics by region

From: Breast cancer stage at diagnosis and area-based socioeconomic status: a multicenter 10-year retrospective clinical epidemiological study in China

  Total Beijing
(North)
Liaoning
(Northeast)
Hunan
(Central)
Guangdong
(South)
Zhejiang
(East)
Shannxi
(Northwest)
Sichuan
(Southwest)
Statistical value P-value
Demographic Characteristic Total N = 4211 Total N = 641 Total N = 832 Total N = 546 Total N = 604 Total N = 606 Total N = 483 Total N = 499   
  N (%) N (%) N (%) N (%) N (%) N (%) N (%) N (%)   
Age at diagnosis (years)           
   Mean ± SD 48.68 ± 10.47 50.45 ± 10.92 48.88 ± 9.95 48.25 ± 10.34 47.82 ± 10.94 47.35 ± 9.58 50.10 ± 11.01 47.86 ± 10.32 7.63* < 0.001
   ≤ 40 919 (21.8) 113 (17.6) 161 (19.4) 133 (24.4) 155 (25.7) 147 (24.3) 89 (18.4) 121 (24.2)   
   40-69 3126 (74.2) 489 (76.3) 645 (77.5) 387 (70.9) 429 (71.0) 443 (73.1) 369 (76.4) 364 (72.9)   
   ≥ 70 166 (3.9) 39 (6.1) 26 (3.1) 26 (4.8) 20 (3.3) 16 (2.6) 25 (5.2) 14 (2.8)   
Body Mass Index (kg/m 2 ) (1)           
   Mean ± SD 23.35 ± 2.89 24.65 ± 3.46 24.01 ± 3.08 21.72 ± 1.85 23.25 ± 3.47 22.28 ± 2.86 23.25 ± 1.29 23.25 ± 1.82 67.42* < 0.001
   ≤ 24.99 3287 (78.1) 371 (57.9) 559 (67.2) 520 (95.2) 422 (70.2) 492 (81.2) 464 (96.1) 460 (92.2)   
   ≥ 25.00 921 (21.9) 270 (42.1) 273 (32.8) 26 (4.8) 180 (29.8) 114 (18.8) 19 (3.9) 39 (7.8)   
Occupation           
   Homemaker 173 (4.0) 17 (2.7) 2 (0.2) 72 (13.2) 39 (6.5) 11 (1.8) 14 (2.9) 18 (3.6) 6.52** < 0.001
   Manual worker 1893 (45.0) 230 (35.9) 258 (31.1) 185 (33.9) 159 (26.3) 487 (80.4) 261 (54.0) 313 (62.7)   
   White-collar worker 1028 (24.4) 203 (31.7) 174 (20.9) 168 (30.8) 167 (27.6) 61 (10.1) 153 (31.7) 102 (20.4)   
   Other 529 (12.6) 70 (10.9) 99 (11.9) 114 (20.9) 162 (26.8) 40 (6.6) 19 (3.9) 25 (5.0)   
   Unknown 588 (14.0) 121 (18.9) 299 (35.9) 7 (1.2) 77 (12.8) 7 (1.1) 36 (7.5) 41 (8.2)   
Education           
   None 186 (4.4) 5 (0.8) 1 (0.1) 0 (0.0) 41 (6.8) 124 (20.5) 14 (2.9) 1 (0.2) 4.63*** < 0.001
   Primary school 462 (11.0) 3 (0.5) 0 (0.0) 125 (22.9) 116 (19.2) 173 (28.5) 39 (8.1) 6 (1.2)   
   Middle school 606 (14.4) 0 (0.00) 0 (0.0) 147 (26.9) 172 (28.5) 165 (27.2) 115 (23.8) 7 (1.4)   
   High school 441 (10.5) 0 (0.00) 2 (0.2) 122 (22.3) 143 (23.7) 56 (9.2) 116 (24.0) 2 (0.4)   
   University and above 396 (9.4) 4 (0.6) 23 (2.8) 150 (27.5) 112 (18.5) 29 (4.8) 76 (15.7) 2 (0.4)   
   Unknown 2120 (50.3) 629 (98.1) 806 (96.9) 2 (0.4) 20 (3.3) 59 (9.8) 123 (25.5) 481 (96.4)   
Marital Status           
   Single 51 (1.2) 6 (0.9) 9 (1.1) 4 (0.7) 17 (2.8) 5 (0.8) 3 (0.6) 7 (1.4) 56.43** < 0.001
   Married 4090 (97.1) 620 (96.7) 821 (98.7) 525 (96.2) 586 (97.0) 589 (97.2) 474 (98.1) 475 (95.2)   
   Widowed/Divorced 52 (1.2) 12 (1.9) 0 (0.0) 17 (3.1) 0 (0.0) 7 (1.2) 5 (1.0) 11 (2.2)   
   Unknown 18 (0.5) 3 (0.5) 2 (0.2) - 1 (0.2) 5 (0.8) 1 (0.2) 6 (1.2)   
  1. *: one-way ANOVA
  2. **: Chi-square test
  3. ***: Fisher's exact test
  4. (1): Missing BMI values were replaced with the mean from available data, 23.35 kg/m2