condition mean min max ZT0-3 7.8170616666666675 4.120525 9.810500000000001 ZT4-7 5.12448 5.12448 5.12448 ZT8-11 5.414935 5.414935 5.414935 ZT12-15 9.0409325 7.130915 10.95095 ZT16-19 10.029835 10.029835 10.029835 ZT20-23 11.65955 11.65955 11.65955