Table 2. Mean growth rates of the diameter, volume, and mass of the 114 malignant SPNs at different time points during follow-up (mean ± SD).

Time point (months)	Parameter	Pure GGNs (%)	Part-solid nodules (%)	Solid nodules (%)
3	Diameter	6.19±5.96	5.91±4.96	12.15±15.45
	Volume	13.56±11.31	12.32±21.63	41.78±43.40
	Mass	16.54±11.35	17.24±15.35	50.67±50.20
6	Diameter	9.49±8.65	6.31±4.16	22.94±20.99
	Volume	16.98±9.50	14.04±9.07	71.28±45.28
	Mass	25.43±13.13	17.55±8.24	88.45±56.23
12	Diameter	9.78±9.78	9.12±8.04	33.23±34.82
	Volume	17.82±11.77	24.23±16.94	98.81±81.87
	Mass	26.13±12.69	32.63±20.14	120.77±97.68
18	Diameter	18.53±20.58	11.22±9.64	47.82±22.87
	Volume	30.41±28.70	24.78±13.43	210.62±98.16
	Mass	49.02±43.23	36.34±17.84	258.37±122.89
24	Diameter	23.82±21.31	20.14±7.86	59.20±42.88
	Volume	33.29±35.47	49.72±59.73	282.78±164.96
	Mass	51.37±35.73	79.49±107.80	456.10±302.76

SPN, solitary pulmonary nodule; SD, standard deviation.