condition mean min max ZT0-3 71.0 71.0 71.0 ZT4-7 85.3 85.3 85.3 ZT8-11 55.6 55.6 55.6 ZT12-15 65.95 65.95 65.95 ZT16-19 58.150000000000006 58.150000000000006 58.150000000000006 ZT20-23 44.8 44.8 44.8