condition mean min max ZT0-3 34.27693333333334 32.4628 36.075 ZT4-7 51.659800000000004 51.659800000000004 51.659800000000004 ZT8-11 29.85295 29.85295 29.85295 ZT12-15 36.34225 31.444699999999997 41.2398 ZT16-19 37.582300000000004 37.582300000000004 37.582300000000004 ZT20-23 31.9523 31.9523 31.9523