condition mean min max ZT0-3 37.242225 37.05265 37.431799999999996 ZT4-7 34.0369 34.0369 34.0369 ZT8-11 31.7325 31.7325 31.7325 ZT12-15 0 0 0 ZT16-19 52.76085 52.76085 52.76085 ZT20-23 43.672349999999994 43.672349999999994 43.672349999999994