condition mean min max ZT0-3 2.4 2.4 2.4 ZT4-7 4.1 4.1 4.1 ZT8-11 29.349999999999998 29.349999999999998 29.349999999999998 ZT12-15 2.85 2.85 2.85 ZT16-19 19.7 19.7 19.7 ZT20-23 11.75 11.75 11.75