condition mean min max ZT0-3 5.2170825 5.085365 5.3488 ZT4-7 8.31249 8.31249 8.31249 ZT8-11 6.09546 6.09546 6.09546 ZT12-15 0 0 0 ZT16-19 6.325925 6.325925 6.325925 ZT20-23 9.44984 9.44984 9.44984