condition mean min max ZT0-3 4.43696 4.43696 4.43696 ZT4-7 3.95282 3.95282 3.95282 ZT8-11 4.58381 4.58381 4.58381 ZT12-15 3.03794 3.03794 3.03794 ZT16-19 3.25784 3.25784 3.25784 ZT20-23 4.24204 4.24204 4.24204