condition mean min max ZT0-3 47.166349999999994 47.166349999999994 47.166349999999994 ZT4-7 37.47295 37.47295 37.47295 ZT8-11 29.8534 29.8534 29.8534 ZT12-15 36.050700000000006 36.050700000000006 36.050700000000006 ZT16-19 50.552 50.552 50.552 ZT20-23 51.899550000000005 51.899550000000005 51.899550000000005