condition mean min max ZT0-3 5880.26907 5880.26907 5880.26907 ZT4-7 6421.1962935 6421.1962935 6421.1962935 ZT8-11 8624.8589035 8624.8589035 8624.8589035 ZT12-15 10048.945063 10048.945063 10048.945063 ZT16-19 11417.593014999999 11417.593014999999 11417.593014999999 ZT20-23 11655.586335 11655.586335 11655.586335