condition mean min max ZT0-3 48.0 48.0 48.0 ZT4-7 31.2 31.2 31.2 ZT8-11 68.1 68.1 68.1 ZT12-15 58.95 58.95 58.95 ZT16-19 24.950000000000003 24.950000000000003 24.950000000000003 ZT20-23 94.1 94.1 94.1