CH_V2_29 Nervosity feelings I

[mabablue]

https://sirkos.github.io/challenge/Challenge/C29.ttl.html

Variable Description: In the past 30 days, how often did you feel nervous?

[SirkoS]

in my view the constraint needs a minor change to "during the last 30 days"

[gwemon]

'Frequency' could also be 'count'

[mabablue]

@gwemon frequency is count per time; this is constraint by the period of 30 days