We adjusted all the variables and calculate odds ratio (OR) of high K6 (K6 score ≥ 13). Potential risk factors for high K6 were examined in the multivariable logistic regression model, including ART facility, age, educational background, marital status, living with a partner, annual family income, duration of infertility, past history of childbirth, fertility treatment, adjuvant treatment, cumulative expense for fertility treatment, fitness habits, smoking, and alcohol. In this study, the number of previous clinical pregnancy loss was not associated with K6 score in univariate analysis, thus a history of pregnancy loss was not included in the variables in multivariate analysis (Supplemental Table 1). All probability values for statistical tests were two-tailed, and values of p < 0.05 were regarded as statistically significant. All statistical analyses were performed using SAS Studio 3.8 (SAS Institute, Inc., Cary, NC, USA).

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