condition mean min max ZT0-3 19.05 19.05 19.05 ZT4-7 19.2 19.2 19.2 ZT8-11 14.0 14.0 14.0 ZT12-15 22.549999999999997 22.549999999999997 22.549999999999997 ZT16-19 23.4 23.4 23.4 ZT20-23 19.9 19.9 19.9