condition mean min max ZT0-3 1.0401620512499998 0.72055498 1.3597691225 ZT4-7 1.8706020629999998 1.188449456 2.5527546699999997 ZT8-11 1.883909606 1.6735299405 2.0942892715 ZT12-15 1.87762543175 1.7170348535 2.03821601 ZT16-19 1.1984344379999998 1.1906590929999998 1.2062097829999998 ZT20-23 2.31846776225 1.829464954 2.8074705704999996