Table 2.
The frequency of gastrointestinal symptoms according to the three genotype groups of lactase persistence/nonpersistence during previous three months
| Abdominal complaints | C/C % (n) | C/T % (n) | T/T % (n) | OR C/C vs C/T | P | OR C/C vs T/T | P |
| (95% CI) | (95% CI) | ||||||
| During previous three months | 84 (280/332) | 79 (698/885) | 78 (501/641) | 1.44 (1.03-2.02) | < 0.05 | 1.50 (1.06-2.14) | < 0.05 |
| Daily | 23 (78/338) | 22 (199/891) | 19 (127/652) | 1.04 (0.77-1.41) | NS | 1.24 (0.90-1.71) | NS |
| Every other day | 21 (72/338) | 16 (145/891) | 20 (129/652) | 1.39 (1.02-1.91) | < 0.05 | 1.10 (0.79-1.52) | NS |
| Once a week | 22 (74/338) | 20 (176/891) | 18 (115/652) | 1.14 (0.84-1.55) | NS | 1.31 (0.94-1.82) | NS |
| More seldom than once a week | 17 (58/338) | 20 (177/891) | 21 (138/652) | 0.84 (0.60-1.16) | NS | 0.77 (0.55-1.08) | NS |
| No complaints | 16 (52/332) | 21 (187/885) | 22 (140/641) | 1.44 (1.03-2.02) | < 0.05 | 1.50 (1.06-2.13) | < 0.05 |