condition mean min max ZT0-3 7.15 7.15 7.15 ZT4-7 2.7 2.7 2.7 ZT8-11 8.85 8.85 8.85 ZT12-15 16.349999999999998 16.349999999999998 16.349999999999998 ZT16-19 4.85 4.85 4.85 ZT20-23 25.0 25.0 25.0