condition mean min max ZT0-3 2.9018050000000004 2.75118 3.05243 ZT4-7 4.2634050000000006 4.2634050000000006 4.2634050000000006 ZT8-11 6.00991 6.00991 6.00991 ZT12-15 0 0 0 ZT16-19 3.23951 3.23951 3.23951 ZT20-23 3.586145 3.586145 3.586145