Find the strata commands for the following?

Haemoglobin levels (Hb) are an indicator for iron deficiency and potential blood loss. Hb was measured on day of enrolment [D0Hb] and the last day of follow up [D42Hb] and is reported as g/dL. Assess if Hb differed significantly between the two-time points and provide the result of your analysis in one sentence. Keep in mind that you are looking at repeated measurements within the same individual?

Do Hb values on day 0 [D0Hb] differ between males and females [Sex]?