condition mean min max ZT0-3 10.391312 10.391312 10.391312 ZT4-7 11.0730255 11.0730255 11.0730255 ZT8-11 10.8327585 10.8327585 10.8327585 ZT12-15 11.33166 11.33166 11.33166 ZT16-19 13.9307905 13.9307905 13.9307905 ZT20-23 12.015504499999999 12.015504499999999 12.015504499999999