How many cups of coffee were the 31 drinking?
What time of day were they drinking it?
How many years had they been drinking it?
What type of job do they have?
Married, divorced or part of the LGBTWRSTUVWXYZ freak show?
Political background?
Overall health?
Ages?
A study of 62 people is not a study. More like a small random sample.
1500 is generally the smallest group that can be used in a respectable study.