condition mean min max ZT0-3 3.0794425 2.83203 3.326855 ZT4-7 4.2239450000000005 4.2239450000000005 4.2239450000000005 ZT8-11 3.643315 3.643315 3.643315 ZT12-15 0 0 0 ZT16-19 3.536445 3.536445 3.536445 ZT20-23 5.07508 5.07508 5.07508