condition mean min max ZT0-3 25.700000000000003 25.700000000000003 25.700000000000003 ZT4-7 19.0 19.0 19.0 ZT8-11 10.35 10.35 10.35 ZT12-15 24.349999999999998 24.349999999999998 24.349999999999998 ZT16-19 20.65 20.65 20.65 ZT20-23 34.85 34.85 34.85