condition mean min max ZT0-3 21.0 21.0 21.0 ZT4-7 20.6 20.6 20.6 ZT8-11 36.0 36.0 36.0 ZT12-15 22.9 22.9 22.9 ZT16-19 20.4 20.4 20.4 ZT20-23 15.899999999999999 15.899999999999999 15.899999999999999