condition mean min max ZT0-3 22.5 22.5 22.5 ZT4-7 11.0 11.0 11.0 ZT8-11 44.150000000000006 44.150000000000006 44.150000000000006 ZT12-15 42.05 42.05 42.05 ZT16-19 14.8 14.8 14.8 ZT20-23 31.2 31.2 31.2