Table 1 Summary of baseline subject characteristics

Age (yr)

72 (68–75)

69 (67.75–74)

0.256

Sex

0.731

 Male

20

18

 Female

19

20

BMI (kg/m²)

23.53 (4.29)

23.70(3.24)

0.109

ASA physical status

0.429

 I

0

0

 II

14

17

 III

25

21

Preoperative medical history

 Hypertension

15

12

0.527

 Diabetes mellitus

3

0

0.081

 Cerebrovascular accident

8

6

0.591

 Cerebral infarction

7

2

0.083

Active tobacco

15

18

0.430

Preoperative anxiety scores

3 (2–3)

3(2–3)

0.117

Surgery characteristics

 Surgery duration

118 (110–126)

116 (109.5–125)

0.713

 One-lung ventilation duration

100 (93–103)

96.5 (91.5–106)

0.510

 Anesthesia duration

137 (128–140)

135 (126.75–138.25)

0.196

Nodule characteristics

0.237

 Malignant

33

28

 Benign

6

10

Lobectomy locations

0.605

 Left upper lobe

7

12

0.165

 Left lower lobe

4

5

0.692

 Right upper lobe

15

11

0.377

 Right middle lobe

5

5

0.965

 Right lower lobe

8

5

0.389