condition mean min max ZT0-3 0.731741 0.342399 1.121083 ZT4-7 0.9142 0.9142 0.9142 ZT8-11 0.5671740000000001 0.5671740000000001 0.5671740000000001 ZT12-15 0 0 0 ZT16-19 1.010295 1.010295 1.010295 ZT20-23 1.468068 1.468068 1.468068