Table 1 Baseline demographic and tumor characteristics of married and unmarried patients
| Â | Before PSM | After PSM | ||||||
|---|---|---|---|---|---|---|---|---|
Characteristics | Total n = 21,148(%) | married n = 10,603(%) | unmarried n = 10,545(%) | P value | Total n = 14,412(%) | married n = 7206(%) | unmarried n = 7206(%) | P value |
Year of diagnosis |  |  |  | < 0.001 |  |  |  | 1.00 |
 1975–2000 | 11,720(55.4%) | 6101(57.5%) | 5619(53.3%) |  | 7780(54.0%) | 3890(54.0%) | 3890(54.0%) |  |
 2001–2017 | 9428(44.6%) | 4502(42.5%) | 4926(46.7%) |  | 6632(46.0%) | 3316(46.0%) | 3316(46.0%) |  |
age |  |  |  | < 0.001 |  |  |  | 1.00 |
 < 45 | 9000(42.6%) | 5035(47.5%) | 3965(37.6%) |  | 6502(45.1%) | 3251(45.1%) | 3251(45.1%) |  |
 45–59 | 6051(28.6%) | 3349(31.6%) | 2702(25.6%) |  | 4144(28.8%) | 2072(28.8%) | 2072(28.8%) |  |
 ≥ 60 | 6097(28.8%) | 2219(20.9%) | 3878(36.8%) |  | 3766(26.1%) | 1883(26.1%) | 1883(26.1%) |  |
Race |  |  |  | < 0.001 |  |  |  | 1.00 |
 White | 16,092(76.1%) | 8345(78.7%) | 7747(73.5%) |  | 11,678(81.0%) | 5839(81.0%) | 5839(81.0%) |  |
 Black | 2241(10.6%) | 646(6.1%) | 1595(15.1%) |  | 1046(7.3%) | 523(7.3%) | 523(7.3%) |  |
 Others | 2815(13.3%) | 1612(15.2%) | 1203(11.4%) |  | 1688(11.7%) | 844(11.7%) | 844(11.7%) |  |
Histologic type |  |  |  | < 0.001 |  |  |  | 1.00 |
 SCC | 14,314(67.6%) | 6776(63.9%) | 7538(71.5%) |  | 10,374(72.0%) | 5187(72.0%) | 5187(72.0%) |  |
 AC | 4204(19.9%) | 2460(23.2%) | 1744(16.65%) |  | 2522(17.5%) | 1261(17.5%) | 1261(17.5%) |  |
 Other | 2630(12.4%) | 1367(12.9%) | 1263(12.0%) |  | 1516(10.5%) | 758(10.5%) | 758(10.5%) |  |
Grade |  |  |  | < 0.001 |  |  |  | 1.00 |
 Well | 3044(14.4%) | 1739(16.4%) | 1305(12.4%) |  | 1900(13.2%) | 950(13.2%) | 950(13.2%) |  |
 Moderately | 8739(41.3%) | 4360(41.1%) | 4379(41.5%) |  | 6238(43.3%) | 3119(43.3%) | 3119(43.3%) |  |
 Poorly/Undiff | 9365(44.3%) | 4505(42.5%) | 4861(46.1%) |  | 6274(43.5%) | 3137(43.5%) | 3137(43.5%) |  |
Stage |  |  |  | < 0.001 |  |  |  | 1.00 |
 Localized | 10,432(49.3%) | 5746(54.2%) | 4686(44.54%) |  | 7548(52.4%) | 3774(52.4%) | 3774(52.4%) |  |
 Regional | 8385(39.6%) | 3834(36.2%) | 4551(43.2%) |  | 5624(39.0%) | 2812(39.0%) | 2812(39.0%) |  |
 Distant | 2331(11.0%) | 1023(9.6%) | 1308(12.4%) |  | 1240(8.6%) | 620(8.6%) | 620(8.6%) |  |
Regional nodes | Â | Â | Â | 0.004 | Â | Â | Â | 1.00 |
 Positive | 1716(8.1%) | 918(8.7%) | 798(7.6%) |  | 1036(7.2%) | 518(7.2%) | 518(7.2%) |  |
 Negative | 19,432(91.9%) | 9685(91.3%) | 9747(92.4%) |  | 13,376(92.8%) | 6688(92.8%) | 6688(92.8%) |  |
Surgery |  |  |  | < 0.001 |  |  |  | 1.00 |
 Yes | 13,076(61.8%) | 7233(68.2%) | 5843(55.4%) |  | 9134(63.4%) | 4567(63.4%) | 4567(63.4%) |  |
 No | 8072(38.2%) | 3370(31.8%) | 4702(44.6%) |  | 5278(36.6%) | 2639(36.6%) | 2639(36.6%) |  |
Radiotherapy |  |  |  | < 0.001 |  |  |  |  |
 Yes | 12,531(59.3%) | 5906(55.7%) | 6625(62.8%) |  | 8500(59.0%) | 4250(59.0%) | 4250(59.0%) | 1.00 |
 No | 8617(40.7%) | 4697(44.3%) | 3920(37.2%) |  | 5912(41.0%) | 2956(41.0%) | 2956(41.0%) |  |
Chemotherapy |  |  |  | < 0.001 |  |  |  | 1.00 |
 Yes | 6117(28.9%) | 2886(27.2%) | 3231(30.6%) |  | 4122(28.6%) | 2061(28.6%) | 2061(28.6%) |  |
 No | 15,031(71.1%) | 7717(72.8%) | 7314(69.4%) |  | 10,290(71.4%) | 5145(71.4%) | 5145(71.4%) |  |