condition mean min max ZT0-3 17.25095 17.25095 17.25095 ZT4-7 14.8965 14.8965 14.8965 ZT8-11 10.1913 10.1913 10.1913 ZT12-15 10.657015000000001 10.657015000000001 10.657015000000001 ZT16-19 17.316850000000002 17.316850000000002 17.316850000000002 ZT20-23 14.83465 14.83465 14.83465