condition mean min max ZT0-3 32.248553815 30.58920235 33.90790528 ZT4-7 26.0061586175 24.641141485 27.37117575 ZT8-11 20.235311415 18.81736077 21.653262060000003 ZT12-15 10.209581521 8.8145826615 11.6045803805 ZT16-19 14.4409964575 11.87932722 17.002665695 ZT20-23 25.542700410000002 24.921878125 26.163522695