As a result, the total population was divided into four groups: control (44), low exposure (48), middle exposure (48) and high exposure (48).
因此所调查人群分为四组，其中对照组44人，低暴露组48人，中暴露组48人，高暴露组48人。
As a result, the total population was divided into four groups: control (44), low exposure (48), middle exposure (48) and high exposure (48).
因此所调查人群分为四组，其中对照组44人，低暴露组48人，中暴露组48人，高暴露组48人。
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