condition mean min max ZT0-3 3.8827999999999996 3.8827999999999996 3.8827999999999996 ZT4-7 2.200875 2.200875 2.200875 ZT8-11 3.46365 3.46365 3.46365 ZT12-15 5.66465 5.66465 5.66465 ZT16-19 8.966485 8.966485 8.966485 ZT20-23 5.162265 5.162265 5.162265