condition mean min max ZT0-3 6.72669 6.285304999999999 7.168075 ZT4-7 8.88593 8.88593 8.88593 ZT8-11 7.090365 7.090365 7.090365 ZT12-15 0 0 0 ZT16-19 9.219165 9.219165 9.219165 ZT20-23 10.53155 10.53155 10.53155