condition mean min max ZT0-3 2.5628349999999998 2.47323 2.65244 ZT4-7 1.884665 1.884665 1.884665 ZT8-11 2.5004049999999998 2.5004049999999998 2.5004049999999998 ZT12-15 0 0 0 ZT16-19 3.144345 3.144345 3.144345 ZT20-23 3.10761 3.10761 3.10761