condition mean min max ZT0-3 1166.765001 1166.765001 1166.765001 ZT4-7 1042.7965239999999 1042.7965239999999 1042.7965239999999 ZT8-11 795.2420085 795.2420085 795.2420085 ZT12-15 821.595764 821.595764 821.595764 ZT16-19 1275.3493425 1275.3493425 1275.3493425 ZT20-23 1993.367734 1993.367734 1993.367734