Table 2. Measures used to examine concurrent validity of the Child Odor in Parenting scale (COPs).

Measure	Description
Self-administered odor questionnaire (SAOQ)[40]	A self-report measure of olfactory acuity developed in Japan. Shown to be associated with odor recognition threshold determined by clinically used olfactory test. (α = .92, items = 20)
Odor Awareness Scale (OAS)*[15]	Measure of person's tendency to notice, pay attention to, or attach importance to odors in the environment. The Japanese version has three subscales. Reduced version of each subscale were used; awareness of positive odors (OAS-positive, α = .69, items = 3), awareness of negative odors (OAS-negative, α = .92, items = 4), and being affected by negative odors (OAS-nega-affected, α = .76, items = 3).
Odors in Everyday Life Questionnaire (OELQ)*[20]	Two of its subscales were used: Sexual role of bodily odor scale (OELQ-body; attracted, aroused, and soothed by body odors, α = .79, items = 4) and Ecological Odor Sensitivity scale (OELQ-ecological; sensitive to, aware of, and attentive to odors in daily life, α = .83, items = 5). Developer of OELQ found that, using sensory evaluation test, scores for those subscales to positively correlate with affective, and cognitive responsiveness respectively[20].
Child Care Questionnaire (CCQ)*	CCQ is prepared based on Parental Responsibility Scale [41, 42, 44]. Score for the original scale is shown to correlate with level of testosterone among fathers of young children[43]. In the CCQ, frequency of involving various child care activities, such as feeding child, playing with child, etc. were asked as a measure of level of involvements in child care (α = .94, items = 13).
Marlowe-Crowne Social desirability scale (MC-SDS) [38, 39]	Measure of social desirability bias, a tendency of respondents to answer questions in a manner that will be viewed favorably by others (α = .77, items = 22).

* Japanese versions were created for those that were not available in Japanese (S1 Text). α, Cronbach's alpha; items, number of items. Numbers in brackets indicate reference number.