Table 2.

Coding guidelines.

Lifestyle factor	Description
Sexually transmitted diseases	Content directly related to sexually transmitted diseases, including Chlamydia trachomatis and gonorrhea, is included. Additionally, content related to sexually transmitted disease screening or examination for causes of infertility is included.
Psychological stress	Content related to psychological stress in daily life or occupational life is included. Additionally, content related to psychological stress caused by infertility is included.
Cigarette smoking	Content directly related to cigarette smoking is included. Additionally, expressions concerning quitting smoking are included.
Alcohol use	Content directly related to alcohol is included. Additionally, expressions concerning alcohol drinking are included.
Nutrition and diet	Content directly related to nutrition and diet is included. Additionally, expressions concerning nutrient factors are included. Content only related to nutrient factors for the purpose of marketing (eg, information about supplement only) is excluded.
Physical activity and exercise	Content directly related to physical activity and exercise is included. Additionally, expressions concerning obesity prevention and exercise in regular life are included.
Underweight	Content directly related to underweight is included. Additionally, expressions concerning precipitous weight loss, dieting, and underweight as indicated by body mass index are included.
Overweight and obesity	Content directly related to overweight and obesity is included. Additionally, expressions concerning precipitous weight gain, and overweight and obesity as indicated by body mass index are included.
Environmental pollutants	Content directly related to environmental pollutants is included. Additionally, expressions concerning environmental hormones are included.