condition mean min max ZT0-3 41.55 41.55 41.55 ZT4-7 14.1 14.1 14.1 ZT8-11 27.15 27.15 27.15 ZT12-15 27.450000000000003 27.450000000000003 27.450000000000003 ZT16-19 19.0 19.0 19.0 ZT20-23 8.95 8.95 8.95