condition mean min max ZT0-3 21.950000000000003 21.950000000000003 21.950000000000003 ZT4-7 20.4 20.4 20.4 ZT8-11 64.8 64.8 64.8 ZT12-15 22.4 22.4 22.4 ZT16-19 20.1 20.1 20.1 ZT20-23 36.55 36.55 36.55