condition mean min max ZT0-3 2900.693595 2900.693595 2900.693595 ZT4-7 2678.4690935 2678.4690935 2678.4690935 ZT8-11 2807.2371715 2807.2371715 2807.2371715 ZT12-15 2069.5749635 2069.5749635 2069.5749635 ZT16-19 2693.3362345 2693.3362345 2693.3362345 ZT20-23 2921.8417959999997 2921.8417959999997 2921.8417959999997