Table 1.

Baseline characteristics of the HPE, HPP, and HPN groups before and after PSM

	HPE	HPP	HPN	p for ANOVA
Before PSM
n	1363	2359	5295
Age (yr)	45.5 ± 12.1	44.8 ± 12.3	43.7 ± 12.7	<  0.001
Female percent (n)	33.2% (452)	34.1% (805)	36.7% (1938)	0.018
BMI	24.2 ± 3.4	24.2 ± 3.3	23.9 ± 3.3	< 0.001
Two-examination time gap (month)	17.1 ± 8.4	19.6 ± 10.0	19.2 ± 10.3	< 0.001
After PSM
n	1363	912	1137
Age	45.5 ± 12.1	45.3 ± 12.8	45.0 ± 12.6	0.530
Female percent (n)	33.2% (452)	31.9% (306)	33.5% (363)	0.703
BMI	24.2 ± 3.4	24.1 ± 3.2	24.0 ± 3.2	0.472
Two-examination time gap (month)	17.1 ± 8.4	17.3 ± 9.1	17.5 ± 9.0	0.143

BMI body mass index, PSM propensity score matching