title: [Determination of lactase deficiency by the hydrogen breath test: a study of 198 healthy Chinese subjects].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001944:Breath Tests; D002648:Child; D002675:Child, Preschool; D005260:Female; D005696:Galactosidases / Q000172:deficiency*; D006801:Humans; D006859:Hydrogen / Q000032:analysis; D007787:Lactose Intolerance / Q000175:diagnosis*; D007789:Lactose Tolerance Test / Q000379:methods; D008297:Male; D008875:Middle Aged; D012494:Sampling Studies; D001616:beta-Galactosidase / Q000172:deficiency*
chemical_list: D006859:Hydrogen; D005696:Galactosidases; D001616:beta-Galactosidase