condition mean min max ZT0-3 9.780014999999999 9.780014999999999 9.780014999999999 ZT4-7 7.6667749999999995 7.6667749999999995 7.6667749999999995 ZT8-11 6.0819600000000005 6.0819600000000005 6.0819600000000005 ZT12-15 7.53519 7.53519 7.53519 ZT16-19 9.917275 9.917275 9.917275 ZT20-23 10.6005 10.6005 10.6005