condition mean min max ZT0-3 84.15 84.15 84.15 ZT4-7 111.5 111.5 111.5 ZT8-11 74.4 74.4 74.4 ZT12-15 103.25 103.25 103.25 ZT16-19 91.05000000000001 91.05000000000001 91.05000000000001 ZT20-23 83.7 83.7 83.7