Serum pepsinogen levels and their influencing factors: A population-based study in 6990 Chinese from North China

Table 2 Serum PG levels in different age groups (median)

Age (yr)	Cases (n)	PGI (μg/L)	PGII (μg/L)	PGI/II
A ( ≤ 40)	1813	86.6a	9.9	8.7
B  (41-50)	2225	86.9b	10.6d	8.3f
C (51-60)	1840	88.6c	11.3e	7.8g
D (≥ 61)	1112	84.0	10.9	7.0h

PGI:

^aP = 0.017,

^bP = 0.031,

^cP = 0.019 vs D group; PGII:

^dP = 0.018 vs A group,

^eP = 0.010 vs B group; PGI/II:

^fP = 0.003 vs A group,

^gP = 0.002 vs B group,

^hP = 0.002 vs C group.