condition mean min max ZT0-3 39.150000000000006 39.150000000000006 39.150000000000006 ZT4-7 36.4 36.4 36.4 ZT8-11 47.9 47.9 47.9 ZT12-15 44.849999999999994 44.849999999999994 44.849999999999994 ZT16-19 53.45 53.45 53.45 ZT20-23 50.3 50.3 50.3