condition mean min max ZT0-3 27.90415 27.90415 27.90415 ZT4-7 26.5987 26.5987 26.5987 ZT8-11 10.160705 10.160705 10.160705 ZT12-15 12.7342 12.7342 12.7342 ZT16-19 12.48375 12.48375 12.48375 ZT20-23 24.78215 24.78215 24.78215