condition mean min max ZT0-3 14.15 14.15 14.15 ZT4-7 5.1 5.1 5.1 ZT8-11 26.349999999999998 26.349999999999998 26.349999999999998 ZT12-15 17.35 17.35 17.35 ZT16-19 37.15 37.15 37.15 ZT20-23 23.299999999999997 23.299999999999997 23.299999999999997