condition mean min max ZT0-3 46.143262 46.143262 46.143262 ZT4-7 51.4009815 51.4009815 51.4009815 ZT8-11 56.9432685 56.9432685 56.9432685 ZT12-15 52.672585999999995 52.672585999999995 52.672585999999995 ZT16-19 46.496660000000006 46.496660000000006 46.496660000000006 ZT20-23 44.609245 44.609245 44.609245