condition mean min max ZT0-3 3.175725 3.175725 3.175725 ZT4-7 2.146055 2.146055 2.146055 ZT8-11 2.080315 2.080315 2.080315 ZT12-15 3.0506900000000003 3.0506900000000003 3.0506900000000003 ZT16-19 3.170895 3.170895 3.170895 ZT20-23 2.580435 2.580435 2.580435