condition mean min max ZT0-3 16.939319 16.939319 16.939319 ZT4-7 11.8481085 11.8481085 11.8481085 ZT8-11 11.6221675 11.6221675 11.6221675 ZT12-15 12.872796000000001 12.872796000000001 12.872796000000001 ZT16-19 11.4116115 11.4116115 11.4116115 ZT20-23 13.7611945 13.7611945 13.7611945