condition mean min max ZT0-3 10.258424027 5.219979267 15.296868787 ZT4-7 35.913491320000006 33.18719805 38.639784590000005 ZT8-11 49.293615165 44.59221823 53.9950121 ZT12-15 50.9136094375 49.902220265 51.92499861 ZT16-19 40.0899443325 38.084977345 42.094911319999994 ZT20-23 25.7296916575 21.50033491 29.959048405