condition mean min max ZT0-3 0.5207621666666666 0.309751 0.677412 ZT4-7 0.328302 0.328302 0.328302 ZT8-11 1.828275 1.828275 1.828275 ZT12-15 1.70364 1.4370349999999998 1.970245 ZT16-19 1.2588195 1.2588195 1.2588195 ZT20-23 0.492509 0.492509 0.492509