condition mean min max ZT0-3 10.003014 10.003014 10.003014 ZT4-7 10.8974105 10.8974105 10.8974105 ZT8-11 14.111454 14.111454 14.111454 ZT12-15 12.862344 12.862344 12.862344 ZT16-19 10.702951500000001 10.702951500000001 10.702951500000001 ZT20-23 11.0728855 11.0728855 11.0728855