condition mean min max ZT0-3 18.9957 18.9957 18.9957 ZT4-7 26.23485 26.23485 26.23485 ZT8-11 16.25655 16.25655 16.25655 ZT12-15 13.72145 13.72145 13.72145 ZT16-19 13.01685 13.01685 13.01685 ZT20-23 12.986 12.986 12.986