condition mean min max ZT0-3 0.647403 0.647403 0.647403 ZT4-7 0.3203365 0.3203365 0.3203365 ZT8-11 0.516231 0.516231 0.516231 ZT12-15 0.828596 0.828596 0.828596 ZT16-19 0.818939 0.818939 0.818939 ZT20-23 0.8394555 0.8394555 0.8394555