condition mean min max ZT0-3 10.047065 10.047065 10.047065 ZT4-7 10.79871 10.79871 10.79871 ZT8-11 8.42066 8.42066 8.42066 ZT12-15 6.86369 6.86369 6.86369 ZT16-19 8.40604 8.40604 8.40604 ZT20-23 10.01947 10.01947 10.01947