condition mean min max ZT0-3 435.87287146 65.22705937 806.51868355 ZT4-7 4214.9121475 2833.7419135 5596.0823815 ZT8-11 3474.20395025 3065.400167 3883.0077335 ZT12-15 2495.5860565 2424.0847154999997 2567.0873975 ZT16-19 819.2069101750001 562.54619585 1075.8676245000001 ZT20-23 449.107391825 438.94012345 459.27466019999997