condition mean min max ZT0-3 23.063683333333334 14.642299999999999 29.38935 ZT4-7 9.76729 9.76729 9.76729 ZT8-11 11.54925 11.54925 11.54925 ZT12-15 13.347625 11.8514 14.84385 ZT16-19 16.46625 16.46625 16.46625 ZT20-23 29.0659 29.0659 29.0659