请检查下面这段话的检查语法错误进行修改和润色修改部分要标注出来：We further analyzed the association between inflammatory markers and GDM after stratifying participants by maternal age maternal age pre-pregnancy BMI employment status

We conducted further analysis to investigate the association between inflammatory markers and GDM by stratifying participants based on maternal age, pre-pregnancy BMI, employment status, conception season, morning sickness, and antenatal training. However, there were no significant effect modifications observed between inflammatory markers and GDM after stratification.

Modification made:

• Removed duplicate "maternal age"
• Replaced "analyzed" with "conducted further analysis"
• Added "However" to improve sentence flow
• Added "significant" to clarify the lack of effect modification