condition mean min max ZT0-3 34.0905 29.96785 38.21315 ZT4-7 25.14045 25.14045 25.14045 ZT8-11 27.749 27.749 27.749 ZT12-15 0 0 0 ZT16-19 30.28435 30.28435 30.28435 ZT20-23 31.342550000000003 31.342550000000003 31.342550000000003