condition mean min max ZT0-3 3.33885 3.053885 3.623815 ZT4-7 2.9100900000000003 2.9100900000000003 2.9100900000000003 ZT8-11 4.488045 4.488045 4.488045 ZT12-15 0 0 0 ZT16-19 4.576605 4.576605 4.576605 ZT20-23 4.2463049999999996 4.2463049999999996 4.2463049999999996