condition mean min max ZT0-3 46.8 46.8 46.8 ZT4-7 41.0 41.0 41.0 ZT8-11 52.8 52.8 52.8 ZT12-15 56.35 56.35 56.35 ZT16-19 46.400000000000006 46.400000000000006 46.400000000000006 ZT20-23 93.35 93.35 93.35