condition mean min max ZT0-3 8.088725 5.88042 10.29703 ZT4-7 3.5361649999999996 3.5361649999999996 3.5361649999999996 ZT8-11 1.51287 1.51287 1.51287 ZT12-15 0 0 0 ZT16-19 4.508 4.508 4.508 ZT20-23 5.323895 5.323895 5.323895