condition mean min max ZT0-3 34.0 34.0 34.0 ZT4-7 41.5 41.5 41.5 ZT8-11 63.35 63.35 63.35 ZT12-15 30.9 30.9 30.9 ZT16-19 53.150000000000006 53.150000000000006 53.150000000000006 ZT20-23 40.95 40.95 40.95