condition mean min max ZT0-3 52.6 52.6 52.6 ZT4-7 17.3 17.3 17.3 ZT8-11 15.95 15.95 15.95 ZT12-15 22.299999999999997 22.299999999999997 22.299999999999997 ZT16-19 10.1 10.1 10.1 ZT20-23 20.5 20.5 20.5