Age- and gender-specific dynamics and next-generation reference intervals for pepsinogen in northern China

Table 1 Baseline characteristics of enrolled subjects, mean ± SD/median (interquartile range) or n (%)

Variable	Value
Age, years	45 (35-54)
Age group, years
20-29	73 (10.3)
30-39	173 (24.4)
40-49	207 (29.2)
50-59	142 (20.1)
≥ 60	113 (16.0)
Sex (male/female)	417 (58.9)/291 (41.1)
PG I (μg/L)	44.0 (36.7-54.0)
PG II (μg/L)	5.9 (4.8-7.3)
CEA (ng/mL)	2.41 (2.05-2.98)
CA724 (KU/L)	1.87 (1.22-3.21)
ALT (U/L)	18.5 (13.3-27.9)
AST (U/L)	19.2 (16.4-23.2)
GGT (U/L)	21.0 (14.0-34.0)
CREA (µmol/L)	76.0 (67.0-88.0)
WBC (× 109/L)	5.5 (4.7-6.5)
Hb (g/L)	147.0 (134.0-157.0)

Continuous variables are presented as mean ± SD or median (IQR), depending on the data distribution. Categorical variables are reported as number (percentage). CEA: Carcinoembryonic antigen; CA724: Carbohydrate antigen 724; PG: Pepsinogen; ALT: Alanine aminotransferase; AST: Aspartate aminotransferase; GGT: Gamma-glutamyl transferase; CREA: Creatinine; WBC: White blood cell; Hb: Hemoglobin; IQR: Interquartile range.