condition mean min max ZT0-3 0.7312323333333334 0.4334825 0.9778095 ZT4-7 0.4073285 0.4073285 0.4073285 ZT8-11 0.2705835 0.2705835 0.2705835 ZT12-15 0.34701225 0.258189 0.43583550000000004 ZT16-19 0.6560185000000001 0.6560185000000001 0.6560185000000001 ZT20-23 0.929752 0.929752 0.929752