condition mean min max ZT0-3 2271.610289 2271.610289 2271.610289 ZT4-7 2478.0704130000004 2478.0704130000004 2478.0704130000004 ZT8-11 2907.238437 2907.238437 2907.238437 ZT12-15 3387.5638154999997 3387.5638154999997 3387.5638154999997 ZT16-19 2697.5339325 2697.5339325 2697.5339325 ZT20-23 1981.8593230000001 1981.8593230000001 1981.8593230000001