condition mean min max ZT0-3 0.6244606666666667 0.42307449999999996 0.931234 ZT4-7 0.54399 0.54399 0.54399 ZT8-11 0.673534 0.673534 0.673534 ZT12-15 1.25544725 0.6953195 1.815575 ZT16-19 0.609652 0.609652 0.609652 ZT20-23 0.6877295000000001 0.6877295000000001 0.6877295000000001