condition mean min max ZT0-3 14.498000000000001 13.88935 15.10665 ZT4-7 7.98812 7.98812 7.98812 ZT8-11 9.47118 9.47118 9.47118 ZT12-15 0 0 0 ZT16-19 13.969899999999999 13.969899999999999 13.969899999999999 ZT20-23 13.892700000000001 13.892700000000001 13.892700000000001