condition mean min max ZT0-3 13.0 13.0 13.0 ZT4-7 29.3 29.3 29.3 ZT8-11 24.200000000000003 24.200000000000003 24.200000000000003 ZT12-15 69.7 69.7 69.7 ZT16-19 62.2 62.2 62.2 ZT20-23 15.9 15.9 15.9