condition mean min max ZT0-3 4.0477515 0.455615 10.745715 ZT4-7 9.90785 9.90785 9.90785 ZT8-11 17.86835 17.86835 17.86835 ZT12-15 6.9011025 3.755295 10.04691 ZT16-19 1.59507 1.59507 1.59507 ZT20-23 0.40394050000000004 0.40394050000000004 0.40394050000000004