condition mean min max ZT0-3 25.021925 21.4713 28.57255 ZT4-7 16.05305 16.05305 16.05305 ZT8-11 10.80095 10.80095 10.80095 ZT12-15 0 0 0 ZT16-19 16.964100000000002 16.964100000000002 16.964100000000002 ZT20-23 17.4057 17.4057 17.4057