condition mean min max ZT0-3 39.4 39.4 39.4 ZT4-7 35.6 35.6 35.6 ZT8-11 23.2 23.2 23.2 ZT12-15 30.299999999999997 30.299999999999997 30.299999999999997 ZT16-19 9.3 9.3 9.3 ZT20-23 37.2 37.2 37.2