condition mean min max ZT0-3 31.6281 27.562649999999998 35.69355 ZT4-7 32.04485 32.04485 32.04485 ZT8-11 40.64315 40.64315 40.64315 ZT12-15 0 0 0 ZT16-19 37.179249999999996 37.179249999999996 37.179249999999996 ZT20-23 29.2012 29.2012 29.2012