condition mean min max ZT0-3 20.15 20.15 20.15 ZT4-7 43.9 43.9 43.9 ZT8-11 57.35 57.35 57.35 ZT12-15 29.45 29.45 29.45 ZT16-19 39.900000000000006 39.900000000000006 39.900000000000006 ZT20-23 20.700000000000003 20.700000000000003 20.700000000000003