condition mean min max ZT0-3 184.875765 184.875765 184.875765 ZT4-7 154.29018349999998 154.29018349999998 154.29018349999998 ZT8-11 200.5217645 200.5217645 200.5217645 ZT12-15 185.56851749999998 185.56851749999998 185.56851749999998 ZT16-19 259.7341225 259.7341225 259.7341225 ZT20-23 252.2849535 252.2849535 252.2849535