condition mean min max ZT0-3 711.011352 711.011352 711.011352 ZT4-7 867.7653075000001 867.7653075000001 867.7653075000001 ZT8-11 818.2744245 818.2744245 818.2744245 ZT12-15 467.396014 467.396014 467.396014 ZT16-19 455.12953100000004 455.12953100000004 455.12953100000004 ZT20-23 310.986486 310.986486 310.986486