condition mean min max ZT0-3 16.067405 16.067405 16.067405 ZT4-7 17.614300999999998 17.614300999999998 17.614300999999998 ZT8-11 16.206311499999998 16.206311499999998 16.206311499999998 ZT12-15 29.5916225 29.5916225 29.5916225 ZT16-19 20.102857 20.102857 20.102857 ZT20-23 55.29596599999999 55.29596599999999 55.29596599999999