condition mean min max ZT0-3 10.694596666666667 8.88329 12.16235 ZT4-7 8.01586 8.01586 8.01586 ZT8-11 9.36561 9.36561 9.36561 ZT12-15 13.5769 12.95505 14.19875 ZT16-19 11.549949999999999 11.549949999999999 11.549949999999999 ZT20-23 13.84105 13.84105 13.84105