condition mean min max ZT0-3 17.6613 17.6613 17.6613 ZT4-7 13.410599999999999 13.410599999999999 13.410599999999999 ZT8-11 11.32565 11.32565 11.32565 ZT12-15 13.0335 13.0335 13.0335 ZT16-19 12.5045 12.5045 12.5045 ZT20-23 18.63345 18.63345 18.63345