condition mean min max ZT0-3 12.974734999999999 9.92592 16.02355 ZT4-7 18.8884 18.8884 18.8884 ZT8-11 10.468715 10.468715 10.468715 ZT12-15 0 0 0 ZT16-19 6.00043 6.00043 6.00043 ZT20-23 21.2377 21.2377 21.2377