condition mean min max ZT0-3 4.8815725 4.59559 5.167555 ZT4-7 2.771635 2.771635 2.771635 ZT8-11 3.829565 3.829565 3.829565 ZT12-15 0 0 0 ZT16-19 8.572894999999999 8.572894999999999 8.572894999999999 ZT20-23 13.29325 13.29325 13.29325