condition mean min max ZT0-3 19.13355 19.13355 19.13355 ZT4-7 16.712 16.712 16.712 ZT8-11 13.8003 13.8003 13.8003 ZT12-15 12.902999999999999 12.902999999999999 12.902999999999999 ZT16-19 18.33685 18.33685 18.33685 ZT20-23 20.6615 20.6615 20.6615