condition mean min max ZT0-3 10.595600000000001 10.595600000000001 10.595600000000001 ZT4-7 7.9489350000000005 7.9489350000000005 7.9489350000000005 ZT8-11 8.706924999999998 8.706924999999998 8.706924999999998 ZT12-15 10.83835 10.83835 10.83835 ZT16-19 16.003999999999998 16.003999999999998 16.003999999999998 ZT20-23 11.668800000000001 11.668800000000001 11.668800000000001