condition mean min max ZT0-3 5.356427500000001 4.951345 5.76151 ZT4-7 2.190105 2.190105 2.190105 ZT8-11 5.444445 5.444445 5.444445 ZT12-15 0 0 0 ZT16-19 7.92773 7.92773 7.92773 ZT20-23 7.0544150000000005 7.0544150000000005 7.0544150000000005