condition mean min max ZT0-3 53.17055 34.7982 67.86335 ZT4-7 34.81935 34.81935 34.81935 ZT8-11 42.690749999999994 42.690749999999994 42.690749999999994 ZT12-15 70.362825 66.3186 74.40705 ZT16-19 77.76259999999999 77.76259999999999 77.76259999999999 ZT20-23 91.2301 91.2301 91.2301