A positive or negative family history was used as a dichotomous indicator of familial loading for schizophrenia and related disorders, affective disorders, anxiety disorders, substances abuse/dependence, personality disorders, and any unspecified mental disorder.
Excessive speed was analyzed using a dichotomous variable.
There was unanimous agreement for two-thirds of the subjects using a dichotomous classification scheme.
Species were identified by using a dichotomous key (4 ).
We estimated paternal exposure to DDT before each pregnancy using three approaches: a) a dichotomous indicator for pregnancies before and after exposure began, b) a qualitative index of four exposure categories, and c) an estimation of the DDT metabolite DDE [1,1-dichloro-2,2-bis p-chlorophenyl [1,1-dichloro-2,2-bis p-chlorophenyl [1,1-dichloro-2,2-bis p-chlorophenyl [1,1-dichloro-2,2-bis p-chlorophenyl [1,1-dichloro-2,2-bis p-chlorophenyl
A dichotomous indicator was used to adjust for the availability of a province-wide screening program during follow-up (started in 1998) as it had the effect of increasing diagnostic mammography [ 34, 35].
A person using condoms 30 times out of 60 is at greater risk than a person using condoms two times out of four, yet a dichotomous indicator of practicing unsafe sex, or a percentage measure of condom use would not differentiate between these two individuals.
General job satisfaction was estimated using a probit model with the dependent variable being a dichotomous indicator equal to 1 if the respondent reported being either satisfied or very satisfied with his or her job and 0 otherwise.
The dependent variable of our analysis is a dichotomous indicator of marijuana usage commonly used in the literature [5], [11], [17].
Unlike in Zerai and Tsui [ 4], where a dichotomous indicator of ANC usage was used, a continuous index of the intensity of maternal and child health (MCH) service use was constructed based on a series of questions related to ANC, delivery care, and child vaccination in Hotchkiss et al. [ 5].
