Table 2 Gender-specific for comparison of demographic characteristics between HTs and controls (N = 3990)
Variables | Males | Females | ||||||
|---|---|---|---|---|---|---|---|---|
HTs (n = 614) | Controls (n = 1228) | P valuea | mOR (95%CI) | HTs (n = 715) | Controls (n = 1433) | P valuea | mOR (95%CI) | |
Family income | ||||||||
 Below middle level | 121 (19.7) | 220 (17.9) | 0.351 | 1.12 (0.87–1.45) | 115 (16.1) | 188 (13.1) | 0.063 | 1.27 (0.98–1.64) |
 Middle level and above | 493 (80.3) | 1008 (82.1) |  |  | 600 (83.9) | 1245 (86.9) |  |  |
Education level of father | ||||||||
 High school and below | 521 (84.9) | 1065 (86.7) | 0.273 | 0.86 (0.65–1.14) | 602 (84.2) | 1153 (80.5) | 0.035 | 1.29 (1.01–1.66) |
 College degree and above | 93 (15.1) | 163 (13.3) |  |  | 113 (15.8) | 280 (19.5) |  |  |
Education level of mother | ||||||||
 High school and below | 548 (89.3) | 1116 (89.3) | 0.265 | 0.83 (0.60–1.17) | 644 (90.1) | 1276 (89.0) | 0.467 | 1.12 (0.82–1.52) |
 College degree and above | 66 (10.7) | 112 (10.7) |  |  | 71 (9.9) | 157 (11.0) |  |  |
School administration model | ||||||||
 Fully-closed | 187 (30.5) | 440 (35.8) | 0.013 | NA | 205 (28.7) | 425 (29.7) | 0.002 | NA |
 Semi-closed | 311 (50.6) | 611 (49.8) |  |  | 378 (52.9) | 824 (57.5) |  |  |
 Open | 116 (18.9) | 177 (14.4) |  |  | 132 (18.4) | 184 (12.8) |  |  |
Father’s occupation | ||||||||
 Peasants, no professions | 115 (18.7) | 221 (18.0) | 0.701 | 1.05 (0.81–1.36) | 174 (24.3) | 321 (22.4) | 0.316 | 1.11 (0.90–1.38) |
 Other | 499 (81.3) | 1007 (82.0) |  |  | 541 (75.7) | 1112 (77.6) |  |  |
Mother’s occupation | ||||||||
 Peasants, no professions | 185 (30.3) | 375 (30.5) | 0.858 | 0.98 (0.79–1.22) | 244 (34.1) | 498 (34.8) | 0.765 | 0.97 (0.80–1.18) |
 Other | 429 (69.7) | 853 (69.5) |  |  | 471 (65.9) | 934 (65.2) |  |  |
Recent environment pollution | ||||||||
 Yes | 267 (43.5) | 470 (38.3) | 0.031 | 1.24 (1.01–1.52) | 245 (34.3) | 480 (33.5) | 0.722 | 1.03 (0.85–1.26) |
 No | 347 (56.5) | 758 (61.7) |  |  | 470 (65.7) | 953 (66.5) |  |  |
Superstitious beliefs in life | ||||||||
 Yes | 134 (21.8) | 175 (14.3) | < 0.001 | 1.68 (1.30–2.17) | 108 (15.1) | 194 (13.5) | 0.325 | 1.14 (0.87–1.48) |
 No | 480 (78.2) | 1053 (85.7) |  |  | 607 (84.9) | 1239 (66.5) |  |  |
Boarding school | ||||||||
 Yes | 149 (24.3) | 314 (25.6) | 0.543 | 0.93 (0.74–1.17) | 221 (30.9) | 371 (25.9) | 0.014 | 1.28 (1.04–1.57) |
 No | 465 (75.7) | 914 (74.4) |  |  | 494 (69.1) | 1062 (74.1) |  |  |
Class staff | ||||||||
 Yes | 244 (39.7) | 524 (42.7) | 0.229 | 0.89 (0.72–1.08) | 386 (54.0) | 820 (57.2) | 0.154 | 0.88 (0.73–1.05) |
 No | 370 (60.3) | 704 (57.3) |  |  | 329 (46.0) | 613 (42.8) |  |  |
Family medical history | ||||||||
 Yes | 40 (6.5) | 27 (2.2) | < 0.001 | 3.10 (1.83–5.31) | 43 (6.0) | 25 (1.7) | < 0.001 | 3.60 (2.13–6.21) |
 No | 574 (93.5) | 1201 (97.8) |  |  | 672 (94.0) | 1408 (98.3) |  |  |
Number of family members | ||||||||
 > 5 | 271 (44.1) | 555 (45.2) | 0.667 | 0.96 (0.78–1.17) | 303 (42.4) | 654 (31.7) | 0.152 | 0.88 (0.73–1.05) |
 ≤ 5 | 343 (55.9) | 673 (54.8) |  |  | 412 (57.6) | 779 (68.3) |  |  |
Class size | ||||||||
 > 45 | 353 (57.5) | 597 (48.6) | < 0.001 | 1.43 (1.17–1.75) | 369 (51.6) | 642 (44.8) | 0.003 | 1.31 (1.09–1.58) |
 ≤ 45 | 261 (42.5) | 631 (51.4) |  |  | 346 (48.4) | 791 (55.2) |  |  |
Left-behind adolescents | ||||||||
 Yes | 154 (25.1) | 265 (21.6) | 0.091 | 1.22 (0.96–1.54) | 215 (30.1) | 316 (22.1) | < 0.001 | 1.52 (1.23–1.87) |
 No | 460 (74.9) | 963 (78.4) |  |  | 500 (69.9) | 1117 (77.9) |  |  |
Somatotype | ||||||||
 Ineligible | 389 (63.4) | 699 (56.9) | 0.008 | 1.31 (1.07–1.61) | 383 (53.6) | 710 (49.5) | 0.079 | 1.17 (0.98–1.41) |
 Eligible | 225 (36.6) | 529 (43.1) |  |  | 332 (46.4) | 723 (50.5) |  |  |