condition mean min max ZT0-3 43.567725 43.567725 43.567725 ZT4-7 31.186785999999998 31.186785999999998 31.186785999999998 ZT8-11 20.849024 20.849024 20.849024 ZT12-15 25.534940499999998 25.534940499999998 25.534940499999998 ZT16-19 14.5665515 14.5665515 14.5665515 ZT20-23 14.117663499999999 14.117663499999999 14.117663499999999