condition mean min max ZT0-3 4.1523525 3.9137750000000002 4.39093 ZT4-7 3.0359749999999996 3.0359749999999996 3.0359749999999996 ZT8-11 3.55438 3.55438 3.55438 ZT12-15 0 0 0 ZT16-19 3.007425 3.007425 3.007425 ZT20-23 3.574745 3.574745 3.574745