condition mean min max ZT0-3 16.45 16.45 16.45 ZT4-7 19.5 19.5 19.5 ZT8-11 53.2 53.2 53.2 ZT12-15 29.400000000000002 29.400000000000002 29.400000000000002 ZT16-19 52.150000000000006 52.150000000000006 52.150000000000006 ZT20-23 37.35 37.35 37.35