condition mean min max ZT0-3 10.7 10.7 10.7 ZT4-7 8.9 8.9 8.9 ZT8-11 27.849999999999998 27.849999999999998 27.849999999999998 ZT12-15 11.7 11.7 11.7 ZT16-19 11.0 11.0 11.0 ZT20-23 15.5 15.5 15.5