condition mean min max ZT0-3 77.20006666666667 60.30355 86.6177 ZT4-7 66.43700000000001 66.43700000000001 66.43700000000001 ZT8-11 42.37355 42.37355 42.37355 ZT12-15 56.87205 54.606300000000005 59.1378 ZT16-19 65.06725 65.06725 65.06725 ZT20-23 63.68715 63.68715 63.68715