condition mean min max ZT0-3 35.89973333333334 29.512050000000002 40.64465 ZT4-7 28.5705 28.5705 28.5705 ZT8-11 14.13915 14.13915 14.13915 ZT12-15 14.360025 11.783850000000001 16.9362 ZT16-19 11.3904 11.3904 11.3904 ZT20-23 15.6276 15.6276 15.6276