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Table 1 Baseline characteristics of the study population.

From: Reproducibility of radiomic features in CT images of NSCLC patients: an integrative analysis on the impact of acquisition and reconstruction parameters

Variables Overall cohort
(n = 103)
Scanner Optima CT660
(n = 50)
Scanner DiscoveryCT750 HD
(n = 53)
p value
(scanner)
Tube
voltage
120 kVp
(n = 51)
Tube
voltage
100 kVp
(n = 52)
p value
(kVp)
Gender
 Male
 Female
59 (57%)
44 (43%)
28 (56%)
22 (44%)
31 (58%)
22 (42%)
0.798a 33 (65%)
18 (35%)
26 (50%)
26 (50%)
0.131a
Age
 Mean (median)
 IQR
69.2 (70)
(64–75)
69.4 (70)
(65–75.3)
68.9 (69)
(62–74.5)
0.498c 69.8 (70)
(64–76)
68.6 (68.5)
(62–74.8)
0.251c
Side
 Right
 Left
60 (58%)
43 (42%)
31 (62%)
19 (38%)
29 (55%)
24 (45%)
0.454a 31 (61%)
20 (39%)
29 (56%)
23 (44%)
0.606a
Position
 Upper
 Medium
 Lower
 Mixed
63 (64%)
1 (1%)
29 (30%)
5 (5%)
33 (69%)
1 (2%)
13 (27%)
1 (2%)
30 (60%)
0 (0%)
16 (32%)
4 (8%)
0.360b 30 (61%)
1 (2%)
16 (33%)
2 (4%)
33 (67%)
0 (0%)
13 (27%)
3 (6%)
0.731b
Volume (cm3)
 Mean (median)
 IQR
46.4 (39.1)
(19.1–62.8)
44.2 (40.6)
(19–54.7)
48.5 (38.1)
(19.5–71.9)
0.843c 52.1 (42)
(20.7–67.9)
40.9 (36.7)
(18.4–56.2)
0.181c
Histological type
 Adenocarcinoma
 Squamous cell carcinoma
 Neuroendocrine
83 (82%)
16 (16%)
2 (2%)
38 (78%)
10 (20%)
1 (2%)
45 (87%)
6 (11%)
1 (2%)
0.580b 40 (78%)
9 (18%)
2 (4%)
43 (86%)
7 (14%)
0 (0%)
0.380b
Previous therapy
 No
 Yes
75 (74%)
26 (26%)
38 (76%)
12 (24%)
37 (73%)
14 (27%)
0.692a 33 (66%)
17 (34%)
42 (82%)
9 (18%)
0.060a
Scanner
 Optima CT660
 Discovery CT750 HD
50 (49%)
53 (51%)
25 (49%)
26 (51%)
25 (48%)
27 (52%)
0.924a
Tube voltage (kVp)
 120
 100
51 (50%)
52 (50%)
25 (50%)
25 (50%)
26 (49%)
27 (51%)
0.924a
  1. aχ2 test
  2. bFisher’s exact test
  3. cWilcoxon-Mann-Whitney test. Missing data: histological type (n = 2); previous therapy (n = 2); position (n = 5). IQR Interquartile range