condition mean min max ZT0-3 139.462826 139.462826 139.462826 ZT4-7 324.662606 324.662606 324.662606 ZT8-11 267.3631545 267.3631545 267.3631545 ZT12-15 74.412837 74.412837 74.412837 ZT16-19 35.9146725 35.9146725 35.9146725 ZT20-23 47.224509 47.224509 47.224509