A CT-based nomogram for predicting the risk of adenocarcinomas in patients with subsolid nodule according to the 2021 WHO classification

Table 1 Baseline clinical characteristics of patients with SSNs

Characteristics	Total (N=656)	Derivation cohort (N=407)	Validation cohort (N=249)	t/χ²	P value
Age	52.03 ± 12.26	51.94 ± 12.13	52.17 ± 12.49	-0.231^a	0.818
Sex				0.171^b	0.679
Male	241 (36.7%)	152 (37.3%)	89 (35.7%)
Female	415 (63.3%)	255 (62.7%)	160 (64.3%)
Smoking history				1.277^b	0.258
Never smoker	546 (83.2%)	344 (84.5%)	202 (81.1%)
Current or former smoker	110 (16.8%)	63 (15.5%)	47 (18.9 %)

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