condition mean min max ZT0-3 44.6 44.6 44.6 ZT4-7 13.1 13.1 13.1 ZT8-11 40.5 40.5 40.5 ZT12-15 25.299999999999997 25.299999999999997 25.299999999999997 ZT16-19 31.6 31.6 31.6 ZT20-23 50.900000000000006 50.900000000000006 50.900000000000006