condition mean min max ZT0-3 4.43171 2.3898349999999997 6.473585 ZT4-7 1.8965049999999999 1.8965049999999999 1.8965049999999999 ZT8-11 1.40194 1.40194 1.40194 ZT12-15 0 0 0 ZT16-19 2.3724600000000002 2.3724600000000002 2.3724600000000002 ZT20-23 2.13495 2.13495 2.13495