QUESTION 3 The next two questions relate to the following information. A randomi

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QUESTION 3 The next two questions relate to the following information. A randomised controlled trial involved offering 118 obese Australian adults dietary advice and a supplement. There were three treatment groups: i Standard low-calorie dietary advice and a placebo supplement (control: i Low-calorie dietary advice emphas sing fish and a placebo supplement (fish) ili. Low-calorie dietary advice emphas sing fish and a nutrient LCn3PUFA (fish +S). gure below. The data s presented or each treatment group and as a total h h cludes al parti pants. Note The part pants mean change in body weight as a percentage o baseline body weight and 5% confidence intervals are shown n the that the negative values for mean change in weight indicate all groups experienced weight loss on average 3 Months 12 Months Control Fish Fish+S Total 0 -2 .6 .8 10 -12 -14 Figure, change in % body weight and 95% confidence intervals by treatment group at 3 and 12 months. Looking at the data for the weight loss after 3 months, how would you interpret the differenoes between the means of the different treatment groups? Fill in the blanks with "similar or "different for A and "s or "s notfor B The confidence intervals span values and so there a difference in the mean weight loss of the different treatment groups

Explanation / Answer

From the figure, we can see that the 95% confidence interval at 3 months for
Control group is between -4.25 to -7 (approximately)
Fish is between -3.75 to -6.25 (approximately)
Fish+S is between -4 to -7 (approximately)
Total is between -5 to -6.5 (approximately)

This shows that the 95% confidence interval at 3 months are all overlapping.

From the figure, we can see that the 95% confidence interval at 12 months for
Control group is between -6 to -11.5 (approximately)
Fish is between -5 to -9.5 (approximately)
Fish+S is between -3.5 to -7.5 (approximately)
Total is between -6 to -8.5 (approximately)

This shows that the 95% confidence interval at 12 months are all overlapping.

So, The confidence intervals span similar values and so there is not a difference in the mean weight loss of the treatment groups.

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