condition mean min max ZT0-3 39.523275 37.17815 41.8684 ZT4-7 41.3718 41.3718 41.3718 ZT8-11 56.36025 56.36025 56.36025 ZT12-15 0 0 0 ZT16-19 66.86500000000001 66.86500000000001 66.86500000000001 ZT20-23 53.172399999999996 53.172399999999996 53.172399999999996