Understanding Society User Support

Hi,

I am working on the Nurse Health Assessment database (nurse and blood) combined to the full main interview. I only have included participants from wave 2.
I would like to analyze biomarkers and I need to adjust for the time of day the blood was taken.
I searched for such variable and I think the most appropriate variable is b_strtnurhh. The point is I obtained some people who have started the interview at 1 AM. Among 9,884 individuals, there are 73 in this case.
Here, there is STATA results:

table(b_strtnurhh, useNA="always")

1    2    3    5    6    7    8    9   10   11   12    13   14   15   16   17   18   19   20   21   22 NA 
73   1    1    2    1    3   47   566 1360 1076  583  610  837  725  750  792  1134 1037  258  27    1  0

Should I identify these cases as missing values or is it a mistake and I can correct them by 1 PM ?
Thank you for helping me.

Gaelle