condition mean min max ZT0-3 0.425663707 0.14525671099999998 0.7060707030000001 ZT4-7 2.88984118875 1.8288608924999998 3.9508214850000005 ZT8-11 2.6609123322499997 2.4680874575 2.853737207 ZT12-15 3.16203739275 2.6456492154999998 3.67842557 ZT16-19 2.578831331 2.5513498125 2.6063128495 ZT20-23 2.44713143875 2.327921718 2.5663411595000003