condition mean min max ZT0-3 47.7 47.7 47.7 ZT4-7 4.4 4.4 4.4 ZT8-11 31.549999999999997 31.549999999999997 31.549999999999997 ZT12-15 30.45 30.45 30.45 ZT16-19 40.3 40.3 40.3 ZT20-23 39.4 39.4 39.4