Table 1 Baseline characteristics of study participants according to different operation group status in unmatched and matched cohorts
Variables | Full cohort | After propensity score matching | ||||
|---|---|---|---|---|---|---|
Simple segmentectomy group (n = 160) | Wedge resection group (n = 350) | Standardized Differencea | Simple segmentectomy group (n = 100) | Wedge resection group (n = 100) | Standardized differencea | |
General data | ||||||
Age | 55.4(13.5) | 62.9(16.2) | 0.28 | 57.2(14.1) | 57.7(14.2) | 0.002 |
Male | 95(59.3%) | 192(54.8%) | 0.91 | 58(58%) | 53(53%) | 0.015 |
Tumor size(cm) | 2.92(0.2) | 2.64(0.17) | 0.48 | 2.73(0.19) | 2.71(0.19) | 0.011 |
Solid component size | 1.54(0.14) | 1.92(0.19) | 0.37 | 1.78(0.17) | 1.82(0.18) | 0.013 |
Smoking status | ||||||
Ever | 77(48.1%) | 198(56.5%) | −0.39 | 47(47%) | 49(49%) | 0.003 |
Margin(mm) | 13.2(4.2) | 25.7(5.6) | −0.66 | 19.5(3.6) | 22.4(4.1) | 0.002 |
Median operative time(min) | 121.7(25.3) | 62.9(14.3) | 0.53 | 110.6(19.5) | 71.2(17.9) | 0.013 |
Blood loss (ml) | 210(45.1) | 120(21.7) | 0.77 | 150(26.8) | 130(24.2) | 0.001 |
Dissected lymph nodes(n) | 6(0.57) | 2.5(0.29) | 0.55 | 4(0.34) | 1.5(0.31) | 0.006 |
Tumor Site | ||||||
RUL | 33(20.6%) | 81(23.1%) | 0.456 | 21(21%) | 19(19%) | 0.01 |
RML | 0 | 14(4%) | 0.65 | 0 | 3(3%) | 0.018 |
RLL | 31(19.3%) | 97(27.7%) | −0.541 | 23(23%) | 26(26%) | −0.009 |
LUL | 48(30%) | 69(19.7%) | −0.42 | 37(37%) | 33(33%) | 0.01 |
LLL | 48(30%) | 89(25.4%) | −0.47 | 19(19%) | 19(19%) | 0 |
Histology | ||||||
Adenocarcinoma | 142(88.7%) | 287(82%) | −0.41 | 91(91%) | 89(89%) | 0.01 |
AIS | 46(28.8%) | 98(28%) | −0.33 | 29(29%) | 26(26%) | 0.05 |
MIA | 57(35.6%) | 123(35.1%) | −0.51 | 32(32%) | 34(34%) | 0.04 |
IA | 39(24.3%) | 66(18.9%) | 0.21 | 30(30%) | 29(29%) | −0.012 |
Pulmonary function (%) | 58.6%(4.9) | 53.7%(3.7) | 0.35 | 57.3%(4.5) | 54.2%(3.8) | 0.05 |
Poor pulmonary functionb | 34(21.2%) | 81(23.1%) | −0.44 | 21(21%) | 24(24%) | 0.02 |
Ejection fraction (%) | 67.1%(5.8) | 60.2%(5.1) | 0.38 | 64.6%(5.6) | 61.7%(5.1) | 0.041 |
Poor ejection fractionc | 22(13.8%) | 31(8.9%) | 0.31 | 16(16%) | 13(13%) | 0.023 |