condition mean min max ZT0-3 9.29148 9.29148 9.29148 ZT4-7 8.75552 8.75552 8.75552 ZT8-11 7.792425 7.792425 7.792425 ZT12-15 7.25764 7.25764 7.25764 ZT16-19 8.7089 8.7089 8.7089 ZT20-23 8.033785 8.033785 8.033785