Table 3. Pairwise Comparisons of PET Semi-Quantitatively Parameters between Different Subgroups.

Subgroups	SUVmax		BSV		BSL
	Mean	P	Mean	P	Mean	P
AIS vs. MIA	1.0 vs. 1.9	0.001	1.6 vs. 4.5	< 0.001	2.1 vs. 6.9	< 0.001
AIS vs. IA	1.0 vs. 6.8	0.000	1.6 vs. 10.9	< 0.001	2.1 vs. 37.8	< 0.001
MIA vs. IA	1.9 vs. 6.8	0.000	4.5 vs. 10.9	< 0.001	6.9 vs. 37.8	< 0.001
AIS vs. L	1.0 vs. 3.7	0.000	1.6 vs. 10.5	< 0.001	2.1 vs. 18.9	< 0.001
MIA vs. L	1.9 vs. 3.7	0.005	4.5 vs. 10.5	< 0.001	6.9 vs. 18.9	0.005
M vs. S	13.1 vs. 11.3	0.413	14.3 vs. 9.7	0.907	106.1 vs. 63.2	0.516
L vs. A	3.7 vs. 6.9	0.000	10.5 vs. 9.0	0.073	18.9 vs. 29.0	0.015
L vs. P	3.7 vs. 5.3	0.059	10.5 vs. 25.7	0.005	18.9 vs. 67.3	< 0.001
L vs. S + M	3.7 vs. 11.7	0.000	10.5 vs. 13.4	0.038	18.9 vs. 97.1	< 0.001
L vs. V	3.7 vs. 7.9	0.000	10.5 vs. 30.9	0.019	18.9 vs. 209.9	< 0.001
A vs. P	6.9 vs. 5.3	0.107	9.0 vs. 12.3	< 0.001	29.0 vs. 67.3	0.003
A vs. S + M	6.9 vs. 11.7	0.000	9.0 vs. 13.4	0.008	29.0 vs. 97.1	< 0.001
A vs. V	6.9 vs. 7.9	0.231	9.0 vs. 30.9	< 0.001	29.0 vs. 209.9	0.002
P vs. S + M	5.3 vs. 11.7	0.000	25.7 vs. 13.4	0.385	67.3 vs. 97.1	0.932
P vs. V	5.3 vs. 7.9	0.052	25.7 vs. 30.9	0.433	67.3 vs. 209.9	0.689
S + M vs. V	11.7 vs. 7.9	0.004	13.4 vs. 30.9	0.066	97.1 vs. 209.9	0.713

A = acinar predominant adenocarcinoma, AIS = adenocarcinoma in situ, BSL = background subtracted lesion activity, BSV = background subtracted volume, L = lepidic predominant adenocarcinoma, M = micropapillary adenocarcinoma, MIA = minimally invasive adenocarcinoma, P = papillary predominant adenocarcinoma, S = solid predominant adenocarcinoma, SUVmax = maximum standardized uptake value, S + M = solid predominant and micropapillary adenocarcinoma, V = variant adenocarcinoma