condition mean min max ZT0-3 14.703050000000001 11.8453 16.26 ZT4-7 11.160699999999999 11.160699999999999 11.160699999999999 ZT8-11 7.01905 7.01905 7.01905 ZT12-15 14.417 13.0565 15.7775 ZT16-19 15.6921 15.6921 15.6921 ZT20-23 15.02225 15.02225 15.02225