condition mean min max ZT0-3 40.75 40.75 40.75 ZT4-7 7.1 7.1 7.1 ZT8-11 39.25 39.25 39.25 ZT12-15 45.900000000000006 45.900000000000006 45.900000000000006 ZT16-19 49.349999999999994 49.349999999999994 49.349999999999994 ZT20-23 51.6 51.6 51.6