condition mean min max ZT0-3 9.110035 9.110035 9.110035 ZT4-7 11.948023 11.948023 11.948023 ZT8-11 9.743596499999999 9.743596499999999 9.743596499999999 ZT12-15 10.183670500000002 10.183670500000002 10.183670500000002 ZT16-19 10.134419999999999 10.134419999999999 10.134419999999999 ZT20-23 9.2382275 9.2382275 9.2382275