condition mean min max ZT0-3 14.95 14.95 14.95 ZT4-7 13.1 13.1 13.1 ZT8-11 24.45 24.45 24.45 ZT12-15 45.3 45.3 45.3 ZT16-19 31.349999999999998 31.349999999999998 31.349999999999998 ZT20-23 3.5 3.5 3.5