condition mean min max ZT0-3 4.37534 4.37534 4.37534 ZT4-7 3.536315 3.536315 3.536315 ZT8-11 1.79514 1.79514 1.79514 ZT12-15 3.8283899999999997 3.8283899999999997 3.8283899999999997 ZT16-19 11.33465 11.33465 11.33465 ZT20-23 6.438555 6.438555 6.438555