condition mean min max ZT0-3 5.81883 5.81883 5.81883 ZT4-7 2.190475 2.190475 2.190475 ZT8-11 2.999485 2.999485 2.999485 ZT12-15 10.9512 10.9512 10.9512 ZT16-19 15.424399999999999 15.424399999999999 15.424399999999999 ZT20-23 12.100200000000001 12.100200000000001 12.100200000000001