Compared with the highest quartile of SHBG concentrations , the odds of GDM increased with decreasing quartile ( odds ratio @ -LSB- @ % CI @-@ @ -RSB- ; @ -LSB- @-@ @ -RSB- ; @ -LSB- @-@ @ -RSB- ; P for trend < @ ) , after adjusting for family history of diabetes , prepregnancy BMI , race/ethnicity , alcohol use , prepregnancy weight changes , and homeostasis model assessment of insulin resistance .