condition mean min max ZT0-3 10.351424690750001 9.5089572915 11.19389209 ZT4-7 3.4766910632499997 2.788082266 4.165299860499999 ZT8-11 2.2364290247499996 1.8205039699999999 2.6523540795 ZT12-15 3.89174410475 3.082721069 4.7007671405 ZT16-19 4.02702945 3.4425458705 4.611513029499999 ZT20-23 6.907081413 6.6388343615 7.1753284645