condition mean min max ZT0-3 18.00985 15.92415 20.09555 ZT4-7 10.409980000000001 10.409980000000001 10.409980000000001 ZT8-11 10.523 10.523 10.523 ZT12-15 0 0 0 ZT16-19 16.8231 16.8231 16.8231 ZT20-23 16.6358 16.6358 16.6358