condition mean min max ZT0-3 1.7907925 1.422335 2.15925 ZT4-7 3.208665 3.208665 3.208665 ZT8-11 8.93339 8.93339 8.93339 ZT12-15 0 0 0 ZT16-19 3.599455 3.599455 3.599455 ZT20-23 1.9857 1.9857 1.9857