condition mean min max ZT0-3 1653.158986 1653.158986 1653.158986 ZT4-7 613.083226 613.083226 613.083226 ZT8-11 330.474293 330.474293 330.474293 ZT12-15 460.9436025 460.9436025 460.9436025 ZT16-19 950.3682555 950.3682555 950.3682555 ZT20-23 1363.8714559999999 1363.8714559999999 1363.8714559999999