condition mean min max ZT0-3 8.673995 8.64247 8.70552 ZT4-7 10.526119999999999 10.526119999999999 10.526119999999999 ZT8-11 10.6279 10.6279 10.6279 ZT12-15 0 0 0 ZT16-19 11.702300000000001 11.702300000000001 11.702300000000001 ZT20-23 11.841249999999999 11.841249999999999 11.841249999999999