condition mean min max ZT0-3 44.45 44.45 44.45 ZT4-7 47.8 47.8 47.8 ZT8-11 16.0 16.0 16.0 ZT12-15 54.7 54.7 54.7 ZT16-19 47.150000000000006 47.150000000000006 47.150000000000006 ZT20-23 43.5 43.5 43.5