condition mean min max ZT0-3 15.45 15.45 15.45 ZT4-7 30.2 30.2 30.2 ZT8-11 7.949999999999999 7.949999999999999 7.949999999999999 ZT12-15 30.049999999999997 30.049999999999997 30.049999999999997 ZT16-19 22.2 22.2 22.2 ZT20-23 12.15 12.15 12.15