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 included demographic factors maternal age pre-pregnancy BMI and marital status socioeconomic factors educational attainment employment status birth gender and concep

We included several demographic and socioeconomic factors, as well as birth gender and conceptional season, in our study. Maternal age, pre-pregnancy BMI, and marital status were the demographic factors considered. Maternal age was divided into four groups: ≤25 years, 25-29 years, 30-34 years, and ≥35 years. Pre-pregnancy BMI was calculated using pre-pregnancy weight (in kilograms) divided by height squared (in meters squared) and categorized as underweight (BMI＜18.5), normal weight (18.5 ≤ BMI＜25), or overweight/obese (BMI ≥ 25). Marital status was divided into two categories: unmarried and married. Educational attainment was also considered and included a high degree (college or above), a medium degree (junior college or equivalent), and a low degree (high school or below). Occupation was categorized into two groups: employment and unemployment. Birth gender was classified as male or female, and conceptional season was categorized into two groups: warm season (March-August) and cold season (September-February).

Furthermore, we found that liver enzyme levels and fasting glucose levels during trimester 1 might be associated with the diagnosis of GDM. We collected fasting glucose levels, as well as alanine transaminase (ALT) and aspartate transaminase (AST) levels during trimester 1, and adjusted for them in our models.