condition mean min max ZT0-3 1.475435 1.434495 1.516375 ZT4-7 1.260339 1.260339 1.260339 ZT8-11 1.490875 1.490875 1.490875 ZT12-15 0 0 0 ZT16-19 3.041225 3.041225 3.041225 ZT20-23 1.819455 1.819455 1.819455