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With the exception of computer use and watching television for women, validity of the weekend-day sitting time items has previously been shown to be low.
A few activities included in the questionnaire did not elicit any problems for any group of patients and the validity of these items has previously been questioned (e.g. tying shoe laces, dressing and undressing).
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Unless an exception from the requirement to obtain certified cost or pricing data applies under 15.403-1(b)(1) or (b)(2), at a minimum, the contracting officer shall obtain appropriate data, without certification, on the prices at which the same or similar items have previously been sold and determine if the data is adequate for evaluating the reasonableness of the price.
This constructing of wealth index using these items have previously been used in Ghana [ 26, 27].
These stress-related items have previously been used in noise-related research.
These items have previously been used in Norwegian studies [ 2, 3].
These items have previously been used in the Longitudinal Study of Australian Children [ 50] and in the Baby Business trial [ 3].
In this regard individual UKCAT items have previously been shown to be generally free from differential item functioning (DIF) in terms of item bias according to age, ethnicity, sex and social class.
The HAQ [ 30] and SF-36 [ 22] physical functioning items have previously been translated to the Dutch language and also feature in adapted form (i.e. more response options and sometimes changed wording) in the PROMIS physical function item bank.
The validity of these items have previously been demonstrated: patients whose treatment choice was concordant with their values felt more confident and had less regret with their decision [ 28].
The majority of survey items have previously been used by our research group in similar studies [ 3, 8, 17, 19, 20] The Economic Resource Questionnaire is designed to determine what resources the school has used to implement activities for the K-GFYL intervention.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com