condition mean min max ZT0-3 10.408531 10.408531 10.408531 ZT4-7 11.411472 11.411472 11.411472 ZT8-11 10.000192 10.000192 10.000192 ZT12-15 9.927171999999999 9.927171999999999 9.927171999999999 ZT16-19 10.466326500000001 10.466326500000001 10.466326500000001 ZT20-23 9.6259145 9.6259145 9.6259145