condition mean min max ZT0-3 1922.912649 1922.912649 1922.912649 ZT4-7 1654.4745155 1654.4745155 1654.4745155 ZT8-11 1708.0960965 1708.0960965 1708.0960965 ZT12-15 1449.487176 1449.487176 1449.487176 ZT16-19 1464.231605 1464.231605 1464.231605 ZT20-23 1519.9884625 1519.9884625 1519.9884625