condition mean min max ZT0-3 19.3 19.3 19.3 ZT4-7 17.0 17.0 17.0 ZT8-11 11.200000000000001 11.200000000000001 11.200000000000001 ZT12-15 26.5 26.5 26.5 ZT16-19 12.1 12.1 12.1 ZT20-23 11.35 11.35 11.35