Table 1 Formulas of the analysis

Formula 1 - Disease point prevalence in the sample (%)

P _i = D _i /E _i *100

P = Prevalence (in %) of the disease in the sample

D = Number of diseased cases in the sample

E = Number of individuals in the sample

_i = Age and sex group category i

Formula 2 - Exposure point prevalence in the total population (%)

EP _i = X _i /T _i *100

EP_i = Prevalence (in %) of the exposure in the total population

X_i = Number of exposed individuals in the total population

T_i = Total population

_i = Age and sex group category i

Formula 3 - Disease point prevalence in the total population (%)

P ₂ = X _i /100*P _i

P₂ = Prevalence (in %) of the disease in the total population

X = Number of exposed individuals in the total population

P = Prevalence (in %) of the disease in the sample

_i = Age and sex group category i

Formula 4 - Disability-adjusted life years (DALYs)

DALY _i = YLL _i (a _i *b _i *c _i ) + YLD _i (d _i *e _i )

DALY = Disability-adjusted life years

YLD = Years lived with disability

a = Number of incident cases

b = Disability weight

c = Average duration of disability

YLL = Years of life lost due to premature mortality

d = Number of deaths

e = Standard life expectancy at the age of death

_i = Age and sex group category i

Formula 5 - Disability-adjusted life years (DALYs) per 1,000 population

DALYr _i = DALY _i /T _i *1,000

DALYr = DALYs per 1,000 population

DALY = Number of total DALYs

T = Total population

_i = Age and sex group category i