s.    Variables                                             OR (00%CI)   ---------------------- ------------------------------ -------------------   Age (years)            00--00 (ref.)                                            00--00                         0.00 (0.00--0.00)   Sex                    Male (ref.)                                              Female                         0.00 (0.00--0.00)   BMI                    Underweight (ref.)                                       Normal weight                  0.00 (0.00--0.00)                          Overweight                     0.00 (0.00--0.00)   Inhabitation           Urban (ref.)                                             Rural                          0.00 (0.00--0.00)                          Rural--urban continuum         0.00 (0.00--0.00)   Grade                  First year (ref.)                                        Second year                    0.00 (0.00--0.00)                          Third year                     0.00 (0.00--0.00)                          Fourth year                    0.00 (0.00--0.00)   Residence on campus    No (ref.)                                                Yes                            0.00 (0.00--0.00)   Smoking                No (ref.)                                                Yes                            0.00 (0.00--0.00)   Alcohol consumption    No (ref.)                                                Yes                            0.00 (0.00--0.00)   Sexual behavior        Never active (ref.)                                      Ever active                    0.00 (0.00--0.00)   Gaming addiction       No (ref.)                                                Yes                            0.00 (0.00--0.00)   Physical disease       No (ref.)                                                Yes                            0.00 (0.00--0.00)   Chronic constipation   No (ref.)                                                Yes                            0.00 (0.00--0.00)   Single parent          No (ref.)                                                Yes                            0.00 (0.00--0.00)   Paternal education     High school and below (ref.)                             Junior college                 0.00 (0.00--000)                          Bachelor                       0.00 (0.00--0.00)                          Master                         0.00 (0.00--0.00)                          PhD                            0.00 (0.00--0.00)   Maternal education     High school and below (ref.)                             Junior college                 0.00 (0.00--0.00)                          Bachelor                       0.00 (0.00--0.00)                          Master                         0.00 (0.00--0.00)                          PhD                            0.00 (0.00--0.00)  Abbreviations: BMI, body mass index; CI, confidence interval.  [^0]: Contributed equally