Table 1

Baseline characteristics in 5500 patients who underwent pulmonary resections for lung cancer in Sweden during 2008–2017 according to quintiles of household disposable income

All patientsHousehold disposable income by quintileP value
Q1 (low)Q2Q3Q4Q5 (high)
Number of patients550011001100110011001100
Age, years, mean (SD)68.0 (8.1)69.3 (8.4)68.7 (8.3)68.7 (8.2)67.7 (7.5)65.5 (7.8)<0.001
Female sex3030 (55.1)680 (61.8)616 (56.0)584 (53.1)576 (52.4)574 (52.2)<0.001
Body mass index, kg/m2, mean (SD)25.9 (4.8)25.9 (5.0)25.6 (5.0)26.0 (4.7)26.0 (4.5)26.2 (4.7)0.107
Household composition<0.001
 Two adults, no children2425 (44.1)56 (5.1)295 (26.8)642 (58.4)768 (69.8)664 (60.4)
 One adult, no children2260 (41.1)1016 (92.4)711 (64.6)334 (30.4)126 (11.5)73 (6.6)
 1–2 adults and ≥1 child(ren)815 (14.8)28 (2.5)94 (8.5)124 (11.3)206 (18.7)363 (33.0)
Education<0.001
 <10 years1981 (36.0)500 (45.5)461 (41.9)392 (35.6)383 (34.8)245 (22.3)
 10–12 years2452 (44.6)499 (45.4)484 (44.0)512 (46.5)504 (45.8)453 (41.2)
 >12 years1067 (19.4)101 (9.2)155 (14.1)196 (17.8)213 (19.4)402 (36.5)
Household disposable income, kSEK, mean (SD)311 (171)128 (233)201 (210)273 (228)372 (340)580 (142)<0.001
Smoking status<0.001
 Never smoker851 (15.5)141 (12.8)151 (13.7)178 (16.2)175 (15.9)206 (18.7)
 Former smoker2907 (52.9)493 (44.8)570 (51.8)589 (53.5)629 (57.2)626 (56.9)
 Current smoker1644 (29.9)442 (40.2)355 (32.3)315 (28.6)278 (25.3)254 (23.1)
 Unknown98 (1.8)24 (2.2)24 (2.2)18 (1.6)18 (1.6)14 (1.3)
Alcohol dependency330 (6.0)120 (10.9)69 (6.3)56 (5.1)46 (4.2)39 (3.5)<0.001
Preoperative FEV1, L, mean (SD)2.24 (0.68)2.07 (0.64)2.18 (0.68)2.22 (0.64)2.26 (0.67)2.46 (0.72)<0.001
Performance status<0.001
 03411 (62.0)622 (56.5)666 (60.5)666 (60.5)703 (63.9)754 (68.5)
 11984 (36.1)451 (41.0)411 (37.4)410 (37.3)377 (34.3)335 (30.5)
 2–3105 (1.9)27 (2.5)23 (2.1)24 (2.2)20 (1.8)11 (1.0)
Hypertension2043 (37.1)429 (39.0)425 (38.6)408 (37.1)403 (36.6)378 (34.4)0.169
Ischaemic heart disease972 (17.7)217 (19.7)192 (17.5)198 (18.0)198 (18.0)167 (15.2)0.089
Atrial fibrillation475 (8.6)98 (8.9)96 (8.7)93 (8.5)102 (9.3)86 (7.8)0.798
Hyperlipidaemia693 (12.6)148 (13.5)139 (12.6)146 (13.3)129 (11.7)131 (11.9)0.659
Heart failure295 (5.4)82 (7.5)52 (4.7)62 (5.6)55 (5.0)44 (4.0)0.005
COPD991 (18.0)251 (22.8)221 (20.1)210 (19.1)171 (15.5)138 (12.5)<0.001
Diabetes mellitus763 (13.9)170 (15.5)157 (14.3)154 (14.0)172 (15.6)110 (10.0)0.001
Prior stroke/TIA507 (9.2)121 (11.0)116 (10.5)99 (9.0)83 (7.5)88 (8.0)0.016
Peripheral vascular disease454 (8.3)108 (9.8)108 (9.8)94 (8.5)80 (7.3)64 (5.8)0.002
Chronic kidney disease114 (2.1)20 (1.8)29 (2.6)24 (2.2)21 (1.9)20 (1.8)0.621
Preoperative radiotherapy166 (3.1)38 (3.5)26 (2.4)32 (3.0)34 (3.2)36 (3.3)0.630
Preoperative chemotherapy224 (4.2)46 (4.3)35 (3.3)42 (3.9)43 (4.0)58 (5.4)0.174
Preoperative PET4615 (90.0)898 (88.2)915 (90.3)909 (89.0)923 (90.2)970 (92.1)0.039
Lobectomy or more4465 (81.2)884 (80.4)900 (81.8)876 (79.6)897 (81.5)908 (82.5)0.416
VATS1166 (21.2)207 (18.8)213 (19.4)216 (19.6)231 (21.0)299 (27.2)<0.001
Expanded surgery*230 (4.2)57 (5.2)44 (4.0)52 (4.7)37 (3.4)40 (3.6)0.177
Lymph node sampling4610 (86.1)920 (86.0)922 (86.5)901 (84.4)916 (85.2)951 (88.4)0.083
Incomplete resection258 (4.7)48 (4.4)59 (5.4)52 (4.7)53 (4.8)46 (4.2)0.725
Postoperative histopathology<0.001
 Squamous cell lung cancer1036 (18.8)242 (22.0)240 (21.8)190 (17.3)209 (19.0)155 (14.1)
 Adenocarcinoma3266 (59.4)592 (53.8)632 (57.5)656 (59.6)656 (59.6)730 (66.4)
 Other638 (11.6)127 (11.5)127 (11.5)134 (12.2)132 (12.0)118 (10.7)
 Unknown560 (10.2)139 (12.6)101 (9.2)120 (10.9)103 (9.4)97 (8.8)
Stage†0.055
 IA2148 (39.1)398 (36.2)408 (37.1)443 (40.3)431 (39.2)468 (42.5)
 IB1276 (23.2)271 (24.6)282 (25.6)252 (22.9)251 (22.8)220 (20.0)
 IIA701 (12.7)139 (12.6)148 (13.5)143 (13.0)139 (12.6)132 (12.0)
 IIB608 (11.1)129 (11.7)133 (12.1)115 (10.5)118 (10.7)113 (10.3)
 IIIA767 (13.9)163 (14.8)129 (11.7)147 (13.4)161 (14.6)167 (15.2)
  • Data are n (%) unless otherwise noted.

  • *If any structure other than the lung or lymph nodes was included in the resection (eg, pericardium, diaphragm, thoracic wall).

  • †Pathological stage.

  • kSEK, 1000 Swedish Krona; PET, positron emission tomography; Q, quintile; TIA, transient ischaemic attack; VATS, video-assisted thoracic surgery.