condition mean min max ZT0-3 7.6134275 7.38342 7.8434349999999995 ZT4-7 8.883145 8.883145 8.883145 ZT8-11 5.97468 5.97468 5.97468 ZT12-15 0 0 0 ZT16-19 8.859485 8.859485 8.859485 ZT20-23 9.133610000000001 9.133610000000001 9.133610000000001