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hazard ratio definition

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hazard ratio definition

Postby biology_06er » Fri May 14, 2010 11:18 am

Hey there,

Just another stats question regarding hazard ratios (HR)...so say I have 4 groups of people who drink varying amounts of cups of tea a day with regard to diabetes type 2.

0-1 cups,
1.1-2 cups,
2.1-3 cups,
3.1-5 cups
>5 cups

and then they work out the HR after adjusting for a number of factors such as BMI, smoking, age etc and say the HR for those in the 1.1-2cups/day if 0.77 and in the >5.0 the HR is 0.71 is this the way I would interpret it?

In those who drink 1.1-2 cups of tea a day they have a 23% less chance of developing type 2 diabetes than say someone in the other groups but seeing as the HR for the >5 cups is 0.71 this group have a 29% less chance of developing T2Diabetes?? Hence the >5 are the LEAST LIKELY to develop T2Diabetes??

Have I understood this correctly?

Helllp :S

Thanks,
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Postby JackBean » Sat May 15, 2010 7:34 am

what about the other groups? Do they have bigger or smaller change to get the diabetes?

Also, I think, that it matters, whether you drink the tea with or without sugar. E.g. I'm drinking tea with lot of sugar, so if I drunk 5 cups, I would get like 1 pound of suger per day :lol:
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Re: hazard ratio definition

Postby biology_06er » Sat May 15, 2010 12:56 pm

Hi there,

the HR for all groups are:

0-1 cups (reference group)
1.1-2 cups HR=0.77
2.1-3 cups HR=0.93
3.1-5 cups HR=0.78
>5 cups HR=0.71

so in this case it means that you are 29% less likely to get T2D compared to the other groups if you drink more then 5cups/day right?....is this correct...

good point about the sugar..=)

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