Table 3. MAR example: Results from a hypothetical clinical trial evaluating the effect of treatment on improvement in body fat (Outcome).

a. Results from the whole study population.
Men	Outcome
Treatment	Y	N
				• Outcome in A = 225/300 = 0.75
A	225	75	300	• Outcome in B = 150/300 = 0.50
B	150	150	300	• Risk Ratio = 1.5
	375	225	600
Women	Outcome
Treatment	Y	N
				• Outcome in A = 90/300 = 0.30
A	90	210	300	• Outcome in B = 60/300 = 0.20
B	60	240	300	• Risk Ratio = 1.5
	150	450	600
Total	Outcome
Treatment	Y	N		• Outcome in A = 315/600 = 0.525
				• Outcome in B = 210/600 = 0.35
A	315	285	600	• Risk Ratio =1.5
B	210	390	600	• 95%CI=1.31, 1.71
	525	675	1200	• Mantel Haenszel RR=1.5
				• 95% CI=1.33, 1.70
b. Results from completers following missing data from a Missing At Random Mechanism (MAR)*.
Men	Outcome
Treatment	Y	N
				• Outcome in A = 180/240 = 0.75
A	180	60	240	• Outcome in B = 120/240 = 0.50
B	120	120	240	• Risk Ratio = 1.5
	300	180	480
Women	Outcome
Treatment	Y	N
				• Outcome in A = 81/270 = 0.30
A	81	189	270	• Outcome in B = 27/135 = 0.20
B	27	108	135	• Risk Ratio =1.5
	108	360	405
Total	Outcome
Treatment	Y	N		• Outcome in A = 261/510 = 0.51
				• Outcome in B = 147/375 = 0.39
A	261	249	510	• Risk Ratio = 1.31
B	147	228	375	• 95% CI=1.12, 1.52
	408	477	885	• Mantel Haenszel RR=1.5
				• 95% CI=1.30, 1.73

*Probabilities of missing are dependent on the combination of treatment and gender to mimic an MAR mechanism

Probability Missing for Men in Trt A = 0.20

Probability Missing for Men in Trt B = 0.20

Probability Missing for Women in Trt A = 0.10

Probability Missing for Women in Trt B = 0.55