condition mean min max ZT0-3 10.566391666666666 5.963925 19.4696 ZT4-7 6.25549 6.25549 6.25549 ZT8-11 25.798099999999998 25.798099999999998 25.798099999999998 ZT12-15 21.166925 13.481950000000001 28.8519 ZT16-19 10.62641 10.62641 10.62641 ZT20-23 11.780155 11.780155 11.780155