condition mean min max ZT0-3 6.03464 6.03464 6.03464 ZT4-7 5.240605 5.240605 5.240605 ZT8-11 4.492735 4.492735 4.492735 ZT12-15 5.0495149999999995 5.0495149999999995 5.0495149999999995 ZT16-19 5.00298 5.00298 5.00298 ZT20-23 5.22657 5.22657 5.22657