求助线性回归图表

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求助，图表中IFG vs NGT，IGT vs NGT等也是线性回归做出来的吗？怎么做的？数据中IFG，IGT，NGT，DM为血糖的不同状态

文中是这样描述的， In model 1, the isolated IFG, IGT, and NDD groups had significantly higher baPWV values, compared with the NGT group after adjustment for only age and sex. In model 2, the
IGT and NDD groups, but not isolated the IFG group,
had an independently higher baPWV after further ad-
justment for other variables. Although age, SBP, and
current smoking were positively associated with mean
baPWV, BMI and habitual exercise showed negative
association. These factors accounted for 63.3% of the
total variability.

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关键词：线性回归 Independent variability significant Association further groups higher values

可能是交叉項，即兩個變量相乘

不是吧，是两组之间的比较

我现在已经明白了，可以通过设置哑变量解决，谢谢