condition mean min max ZT0-3 5.14946 5.14946 5.14946 ZT4-7 5.103545 5.103545 5.103545 ZT8-11 3.6279250000000003 3.6279250000000003 3.6279250000000003 ZT12-15 3.8381100000000004 3.8381100000000004 3.8381100000000004 ZT16-19 4.28314 4.28314 4.28314 ZT20-23 4.766943333333334 4.766943333333334 4.766943333333334