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Table 1 The frequency of gastrointestinal symptoms (GI) among young people with lactase-persistent/non-persistent genotype (Question "Have you ever experienced the following symptoms?")

From: Lactase non-persistent genotype influences milk consumption and gastrointestinal symptoms in Northern Russians

  Lactase non-persistence
C/C-13910
(n = 180)
Lactase persistence
C/T and T/T-13910
(n = 338)
 
GI symptoms n % n % p
Stomach-ache 93 51.7 176 51.9 1.00
Regurgitation 23 12.8 42 12.4 0.89
Flatulence 17 9.4 38 11.2 0.65
Heartburn 14 7.8 23 6.8 0.72
Nausea 13 7.2 25 7.4 1.00
Diarrhea 3 1.7 12 3.5 0.28
Without GI symptoms 74 41.1 142 42.2 0.71