condition mean min max ZT0-3 10.691264 10.691264 10.691264 ZT4-7 10.025486 10.025486 10.025486 ZT8-11 13.677074000000001 13.677074000000001 13.677074000000001 ZT12-15 11.1888635 11.1888635 11.1888635 ZT16-19 10.429372 10.429372 10.429372 ZT20-23 10.9279805 10.9279805 10.9279805