Comparing SPEED and OSDI Questionnaires in a Non-Clinical Sample

Figures & data

Table 1 Mean Speed Score by OSDI Categorization

OSDI Scores	OSDI Category	Participants (N)	SPEED Score (Means ± SD)
0–12	Normal	224	3.33 ±3.44
12–22	Mild	134	5.45 ±3.77
23–32	Moderate	88	7.86 ±4.33
33–100	Severe	154	9.39 ±4.56

Abbreviations: OSDI, ocular surface disease index; N, number; SPEED, standard patient evaluation of eye dryness; SD, standard deviation.

Table 2 Cronbach’s Alpha of OSDI Questionnaire and Its Sub-Sections

Category	Cronbach’s Alpha
OSDI	0.924
Ocular	0.790
Vision Related	0.881
Environmental	0.864

Abbreviation: OSDI, ocular surface disease index.

Table 3 Cronbach’s Alpha of SPEED Questionnaire and Its Sub-Sections

Category	Cronbach’s Alpha
SPEED	0.879
Frequency	0.780
Severity	0.833

Abbreviation: SPEED, standard patient evaluation of eye dryness.

Figure 1 Scatter plot of OSDI against SPEED scores.

Abbreviations: SPEED, standard patient evaluation of eye dryness; OSDI, ocular surface disease index.

Table 4 Cutoff Values for SPEED

Cutoff	Sensitivity (%)	Specificity (%)
3.00	80.59	61.16
4.00	73.40	70.54
5.00	67.02	77.23
6.00	58.24	84.82

Abbreviation: SPEED, standard patient evaluation of eye dryness.

Figure 2 Area under the curve for SPEED.

Abbreviation: OSDI, ocular surface disease index.

Table 5 Cohen’s Kappa with Various SPEED Cutoff Values

Cutoff	Cohen’s Kappa	P-value	Sensitivity (%)	Specificity (%)
3.00	0.423	<0.001	80.59	61.16
4.00	0.426	<0.001	73.40	70.54
5.00	0.415	<0.001	67.02	77.23
6.00	0.388	<0.001	58.24	84.82

Abbreviation: SPEED, standard patient evaluation of eye dryness.