To study the time loss for type 2 diabetes patients, can any one suggest the methods to estimate it from social perspective, even some patients considered as a workers , others are unemployed or housewife
The question would have to be fragmented to many areas like time spent attending doctor/medical care, missing house work/work, time spent by others on the patient (=loss of patient's time), etc.
Once decided, aspects of such fragments need be put in to research questionnaire.
You refere to economic evaluation including indirect costs as it is done for models with an societal perspective. In the link I share you find this addressed at page 32/33. The parametrization is usually done by expert opinion and therefore carries a lot of uncertainty. Needs extensive sensitivity testing!
Using a societal perspective leads to problems that you get different cost effectiveness results for different groups of people - older or unemployed are "worth" less - so life years lost or time spent is not calculated as loss to society. Young and educated - high income groups - contribute more to the cost effectiveness (if the intervention works). So in Austria by law only direct costs to the health care system are taken into account. Other guidelines - see link.
HVB is EUNetHTA partner. I also recommend the EUNetHTA Core model for structuring HTAs.