Table 1 Clinicopathological characteristics of the patients before and after propensity score matching
Before PSM | After PSM | |||||||
|---|---|---|---|---|---|---|---|---|
All n = 859 | S + CT n = 609 (%) | S + CRT n = 250 (%) | P-value | All n = 494 | S + CT n = 247(%) | S + CRT n = 247 (%) | P-value | |
Age, years | 0.301 | 1.000 | ||||||
≤65 | 674(78.46) | 484(79.5) | 190(76) | 377(76.32) | 189(76.5) | 188(76.1) | ||
> 65 | 185(21.54) | 125(20.5) | 60(24) | 117(23.68) | 58(23.5) | 59(23.9) | ||
Sex | 0.580 | 0.215 | ||||||
Male | 735(85.56) | 518(85.1) | 217(86.8) | 417(84.41) | 203(82.2) | 214(86.6) | ||
Female | 124(14.44) | 91(14.9) | 33(13.2) | 77(15.59) | 44(17.8) | 33(13.4) | ||
KPS score | 0.001 | 0.786 | ||||||
90-100 | 399(46.45) | 260(42.7) | 139(55.6) | 278(56.28) | 141(57.1) | 137(55.5) | ||
70-80 | 460(53.55) | 349(57.3) | 111(44.4) | 216(43.72) | 106(42.9) | 110(44.5) | ||
Surgery type | 0.010 | 0.279 | ||||||
Open | 540(62.86) | 400(65.7) | 140(56) | 265(53.64) | 126(51) | 139(56.3) | ||
MIE | 319(37.14) | 209(34.3) | 110(44) | 229(46.36) | 121(49) | 108(43.7) | ||
lymph node dissection | < 0.001 | 0.917 | ||||||
two fields | 516(60.07) | 326(53.5) | 190(76) | 372(75.3) | 185(74.9) | 187(75.7) | ||
three fields | 343(39.93) | 283(46.5) | 60(24) | 122(24.7) | 62(25.1) | 60(24.3) | ||
Pathological differentiation | 0.305 | 0.671 | ||||||
Well (G1) | 111(12.92) | 76(12.5) | 35(14) | 73(14.78) | 39(15.8) | 34(13.8) | ||
Moderate (G2) | 366(42.61) | 252(41.4) | 114(45.6) | 215(43.52) | 103(41.7) | 112(45.3) | ||
Poor or undifferentiated (G3–4) | 382(44.47) | 281(46.1) | 101(40.4) | 206(41.7) | 105(42.5) | 101(40.9) | ||
Location | < 0.001 | 0.449 | ||||||
Upper site | 166(19.32) | 92(15.1) | 74(29.6) | 134(27.13) | 62(25.1) | 72(29.1) | ||
Middle site | 456(53.08) | 323(53) | 133(53.2) | 265(53.64) | 133(53.8) | 132(53.4) | ||
Lower site | 237(27.59) | 194(31.9) | 43(17.2) | 95(19.23) | 52(21.1) | 43(17.4) | ||
Resection | 0.002 | 0.430 | ||||||
R0 | 803(93.48) | 580(95.2) | 223(89.2) | 450(91.09) | 228(92.3) | 222(89.9) | ||
R1-2 | 56(6.52) | 29(4.8) | 27(10.8) | 44(8.91) | 19(7.7) | 25(10.1) | ||
Varscular Invasion | 0.210 | 0.397 | ||||||
Yes | 647(75.32) | 451(74.1) | 196(78.4) | 377(76.32) | 184(74.5) | 193(78.1) | ||
No | 212(24.68) | 158(25.9) | 54(21.6) | 117(23.68) | 63(25.5) | 54(21.9) | ||
Nerve invasion | 1.000 | 0.391 | ||||||
Yes | 677(78.81) | 480(78.8) | 197(78.8) | 381(77.13) | 186(75.3) | 195(78.9) | ||
No | 182(21.19) | 129(21.2) | 53(21.2) | 113(22.87) | 61(24.7) | 52(21.1) | ||
Dissection nodes | 0.394 | 0.652 | ||||||
≤20 | 406(47.26) | 294(48.3) | 112(44.8) | 226(45.75) | 116(47) | 110(44.5) | ||
> 20 | 453(52.74) | 315(51.7) | 138(55.2) | 268(54.25) | 131(53) | 137(55.5) | ||
Pathological T status | < 0.001 | 0.130 | ||||||
T1 | 42(4.89) | 30(4.9) | 12(4.8) | 18(3.64) | 6(2.4) | 12(4.9) | ||
T2 | 148(17.23) | 110(18.1) | 38(15.2) | 74(14.98) | 36(14.6) | 38(15.4) | ||
T3 | 573(66.71) | 419(68.8) | 154(61.6) | 329(66.6) | 175(70.9) | 154(62.3) | ||
T4a | 87(10.13) | 49(8) | 38(15.2) | 67(13.56) | 29(11.7) | 38(15.4) | ||
T4b | 9(1.05) | 1(0.2) | 8(3.2) | 6(1.21) | 1(0.4) | 5(2) | ||
Pathological N status | 0.057 | 0.327 | ||||||
N1 | 455(52.97) | 320(52.5) | 135(54) | 281(56.88) | 148(59.9) | 133(53.8) | ||
N2 | 270(31.43) | 183(30) | 87(34.8) | 157(31.78) | 71(28.7) | 86(34.8) | ||
N3 | 134(15.6) | 106(17.4) | 28(11.2) | 56(11.34) | 28(11.3) | 28(11.3) | ||
Pathological TNM stage | 0.896 | 0.629 | ||||||
IIB | 28(3.26) | 20(3.3) | 8(3.2) | 13(2.63) | 5(2) | 8(3.2) | ||
IIIA | 97(11.29) | 72(11.8) | 25(10) | 52(10.53) | 27(10.9) | 25(10.1) | ||
IIIB | 562(65.42) | 396(65) | 166(66.4) | 341(69.03) | 175(70.9) | 166(67.2) | ||
IVA | 172(20.02) | 121(19.9) | 51(20.4) | 88(17.81) | 40(16.2) | 48(19.4) | ||