condition mean min max ZT0-3 5.570577500000001 4.289960000000001 6.851195000000001 ZT4-7 1.67128 1.67128 1.67128 ZT8-11 1.113689 1.113689 1.113689 ZT12-15 0 0 0 ZT16-19 3.4385 3.4385 3.4385 ZT20-23 3.66173 3.66173 3.66173