condition mean min max ZT0-3 1.2116877499999998 0.9749355 1.44844 ZT4-7 1.4564750000000002 1.4564750000000002 1.4564750000000002 ZT8-11 1.063322 1.063322 1.063322 ZT12-15 0 0 0 ZT16-19 1.4994399999999999 1.4994399999999999 1.4994399999999999 ZT20-23 1.809855 1.809855 1.809855