condition mean min max ZT0-3 39.7 39.7 39.7 ZT4-7 16.5 16.5 16.5 ZT8-11 5.45 5.45 5.45 ZT12-15 28.549999999999997 28.549999999999997 28.549999999999997 ZT16-19 40.2 40.2 40.2 ZT20-23 28.5 28.5 28.5