condition mean min max ZT0-3 10.0536775 9.703255 10.4041 ZT4-7 6.4748850000000004 6.4748850000000004 6.4748850000000004 ZT8-11 5.545825 5.545825 5.545825 ZT12-15 0 0 0 ZT16-19 7.38747 7.38747 7.38747 ZT20-23 8.081585 8.081585 8.081585