condition mean min max ZT0-3 5.31561 4.114425000000001 6.516795 ZT4-7 9.38487 9.38487 9.38487 ZT8-11 88.33715 88.33715 88.33715 ZT12-15 0 0 0 ZT16-19 24.65885 24.65885 24.65885 ZT20-23 11.51965 11.51965 11.51965