Risk factors OR [95 % CI]
Group 2 ( 18 - 25 year-olds) 3.0 [1.435 - 6.272], P = 0.004a
Training duration 5 - 10 years
Training duration > 10 years
1.5 [0.515 - 4.367], P = 0.457
3.067 [1.048 - 8.974], P = 0.041a
Hours spend per week in a swimming pool 4 - 6 hours.
Hours spend per week in a swimming pool > 6 hours.
1.407 [0.456 - 4.342], P = 0.552
1.159 [0.463 - 2.901], P = 0.753
Complaints about GERD/increased acidity of the stomach/frequent vomiting/dry mouth 0.823 [0.339 - 1.999], P = 0.667
Regular intake of acidic medicines (vitamin C, acetylsalicylic acid) 1.065 [0.388 - 2.919], P = 0.903
Daily consumption of sweet, carbonated drinks 0.99 [0.485 - 2.022], P = 0.978
Daily consumption of sport drinks 1.031 [0.464 - 2.29], P = 0.941

aStatistically significant, Univariate binary logistic regression analysis.