condition mean min max ZT0-3 36.377021299999996 25.96577187 46.788270729999994 ZT4-7 59.6954864225 56.407880004999996 62.98309284 ZT8-11 70.92919746999999 63.36053119 78.49786375 ZT12-15 77.71590621749999 69.96145695999999 85.47035547499999 ZT16-19 70.0888406225 68.90802386 71.269657385 ZT20-23 76.51869712749999 74.907826285 78.12956797