condition mean min max ZT0-3 14.5 14.5 14.5 ZT4-7 9.5 9.5 9.5 ZT8-11 32.6 32.6 32.6 ZT12-15 25.299999999999997 25.299999999999997 25.299999999999997 ZT16-19 14.3 14.3 14.3 ZT20-23 23.5 23.5 23.5