科普英语里一篇文章的问题有一篇VitaminDeficiencyAsthma'Link'里面这句话：OurfindingsindicatethatlowlevelsofvitaminCintakeandtoalesserextentvitaminAareconsistentlyassociatedwithasthmarisktoadegreethat,if

Question

科普英语里一篇文章的问题
有一篇Vitamin Deficiency Asthma 'Link'
里面这句话：Our findings indicate that low levels of vitamin C intake and to a lesser extent vitamin A are consistently associated with asthma risk to a degree that,if causal,would be sufficient to be clinically relevant.
其中a lesser extent vitamin A 的前面为什么是用to?和low levels of vitamin A并列?
请回答详细：）

Answer 1

to an extent是在某种程度上或达到某种程度的意思
我觉得意思应该是 低水平的维C摄入和维A在某种程度上与哮喘有关,但是维A的与哮喘关联的程度较小
to a lesser extent 应该不能做形容词,那么副词就是指与哮喘的关联程度