condition mean min max ZT0-3 13.9815 13.9815 13.9815 ZT4-7 18.84275 18.84275 18.84275 ZT8-11 16.577399999999997 16.577399999999997 16.577399999999997 ZT12-15 19.59485 19.59485 19.59485 ZT16-19 13.2223 13.2223 13.2223 ZT20-23 9.4822 9.4822 9.4822