condition mean min max ZT0-3 194.462092 194.462092 194.462092 ZT4-7 218.352342 218.352342 218.352342 ZT8-11 110.244536 110.244536 110.244536 ZT12-15 122.56976 122.56976 122.56976 ZT16-19 69.9806865 69.9806865 69.9806865 ZT20-23 103.5303785 103.5303785 103.5303785