condition mean min max ZT0-3 0.6356918333333333 0.49982800000000005 0.8861735 ZT4-7 0.40187 0.40187 0.40187 ZT8-11 0.289542 0.289542 0.289542 ZT12-15 0.27914775000000003 0.1721705 0.386125 ZT16-19 0.787201 0.787201 0.787201 ZT20-23 0.6220680000000001 0.6220680000000001 0.6220680000000001