The phrase "a reference item of" is correct and usable in written English.
It can be used when describing an item that serves as a reference or source of information related to a specific topic or subject.
Example: "The library has a variety of reference items of historical significance that researchers can consult."
Alternatives: "a reference material of" or "a reference source of".
In order to diminish the influence of post-treatment score values from items which were rarely involved as reference items (thus attenuating the possible influence of many zero values from those items which rarely detect signs and symptoms), the number of any post-treatment value of any item was weighted again according to the chance of this item of being a reference item.
In order to account for these differences between items in the chance of being a reference item in myogenous TMD patients, the number of any post-treatment value of a reference item was weighted according to this chance.
Also related to selecting items in an adaptive way, one might question whether statistically, an overall reliable change (RC > SDD for score means) can be achieved in patients with a low baseline, who have only reference items of '2' of which some scores decrease by merely one unit rather than consistently by two units.
I always reference items of nostalgia and all the stuff I'm fascinated with, and weave them together by means of words and paint.
Their sum value was 146 and 109 and the number of reference items was 39 and 33 respectively rather than 104 (sum value) and 32 (number of reference items) of the patient from the pilot sample.
The summed score level, mean level, or the total number of scores from reference items of patients for which addition occurred, therefore never exceeded the values of the patient with maximal baseline values from a pilot sample, to which the cut-off point TDC = −0.379 has been tuned (see Appendix, section 'choosing two cut-off points of TDC').
3. Reference items of which relative change was monitored, could be added during treatment (based on data from the clinician) or following treatment (by the investigator, based on data from the blinded assessor) if their scores increased from a low level to a high level (from below SDD in the short-term to above SDD in the long-term).
mean and (between brackets) SD values of TDC for two ways of attributing an initial Contrast-value of an added reference item at the visit of addition, i.e. (i) by calculating the Contrast between the large score value at addition with respect to the low value at baseline using equation (1) (see text), or (ii) by attributing the value zero as initial Contrast-value (cf. Discussion).
Thus even if the initial positive Contrast-value of an added reference item is decisive for non-attaining functional status, a decrease to zero or to a negative value during a subsequent visit will enhance the chance on attaining functional status at a later phase of treatment.
As explained before, the mode of separately added reference items yields an inter-mode bias of the post-treatment TDC-values when the baseline of an added reference item is used for determining its initial Contrast-value.
