condition mean min max ZT0-3 9.793965 9.793965 9.793965 ZT4-7 9.74337 9.74337 9.74337 ZT8-11 9.13296 9.13296 9.13296 ZT12-15 10.86539 10.86539 10.86539 ZT16-19 11.62955 11.62955 11.62955 ZT20-23 9.959119999999999 9.959119999999999 9.959119999999999