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Table 3 Intra-class Correlations for questionnaire items between scrolling features

From: Does scrolling affect measurement equivalence of electronic patient-reported outcome measures (ePROM)? Results of a quantitative equivalence study

Scale/Subscale

Smart Scrolling

Without Smart Scrolling

Non-scrolling

BYOD

Overall

Scrolling vs. Non-Scrolling

BYOD vs Non-Scrolling

Smart Scrolling vs Without Smart Scrolling

mean (SD)

Estimated coefficient of reliability, ICC (95% CI)

SF-12v2

 General Health

46.35 (9.40)

46.65 (9.33)

46.14 (9.41)

46.68 (9.42)

0.96 (0.94, 0.97)

0.96 (0.94, 0.97)

0.94 (0.92, 0.96)

0.96 (0.94, 0.97)

 Physical Functioning

42.96 (9.29)

43.03 (9.07)

42.21 (8.95)

42.96 (9.00)

0.92 (0.89, 0.94)

0.92 (0.89, 0.94)

0.91 (0.87, 0.94)

0.92 (0.89, 0.94)

 Role Physical

44.03 (6.98)

43.15 (7.36)

42.82 (7.14)

43.59 (6.72)

0.81 (0.76, 0.86)

0.81 (0.76, 0.86)

0.80 (0.73, 0.86)

0.82 (0.76, 0.86)

 Bodily Pain

44.71 (6.56)

44.63 (7.67)

45.34 (6.81)

45.89 (7.40)

0.72 (0.65, 0.78)

0.72 (0.65, 0.78)

0.77 (0.68, 0.83)

0.72 (0.65, 0.78)

 Vitality

47.61 (8.76)

46.76 (8.67)

46.84 (8.75)

47.27 (8.70)

0.83 (0.78, 0.87)

0.83 (0.78, 0.87)

0.86 (0.80, 0.90)

0.83 (0.78, 0.87)

 Social Functioning

45.30 (8.75)

45.53 (9.32)

45.15 (8.94)

45.38 (9.05)

0.84 (0.79, 0.87)

0.84 (0.79, 0.87)

0.83 (0.76, 0.88)

0.84 (0.79, 0.87)

 Mental Health

46.85 (9.89)

46.70 (9.67)

46.60 (10.41)

46.65 (10.31)

0.90 (0.87, 0.92)

0.90 (0.87, 0.92)

0.91 (0.87, 0.93)

0.90 (0.87, 0.92)

 Role Emotional

43.35 (10.43)

43.76 (9.88)

43.40 (10.45)

43.54 (10.17)

0.86 (0.81, 0.89)

0.86 (0.81, 0.89)

0.89 (0.84, 0.92)

0.86 (0.81, 0.89)

 Mental Component Summary

46.69 (10.15)

46.75 (10.23)

46.63 (10.92)

46.54 (10.66)

0.93 (0.90, 0.94)

0.93 (0.90, 0.94)

0.94 (0.91, 0.96)

0.93 (0.90, 0.94)

 Physical Component Summary

44.27 (7.52)

43.96 (8.04)

43.70 (7.53)

44.57 (7.86)

0.92 (0.89, 0.94)

0.92 (0.89, 0.94)

0.92 (0.89, 0.94)

0.92 (0.89, 0.94)

 SF-6D Health Utility Index

0.67 (0.11)

0.67 (0.11)

0.67 (0.11)

0.68 (0.11)

0.90 (0.87, 0.93)

0.90 (0.87, 0.93)

0.93 (0.90, 0.95)

0.91 (0.88, 0.93)

EQ-5D-5L

 Index Value

0.76 (0.10)

0.76 (0.11)

0.76 (0.11)

0.77 (0.11)

0.86 (0.82, 0.90)

0.86 (0.82, 0.89)

0.89 (0.85, 0.93)

0.86 (0.82, 0.89)

 EQ VAS

68.75 (17.43)

68.18 (17.54)

69.88 (17.06)

69.76 (18.46)

0.86 (0.81, 0.89)

0.86 (0.81, 0.89)

0.87 (0.82, 0.91)

0.85 (0.81, 0.89)

 Mobility

1.73 (0.78)

1.76 (0.84)

1.71 (0.77)

1.74 (0.80)

0.85 (0.81, 0.89)

0.85 (0.81, 0.89)

0.89 (0.85, 0.92)

0.85 (0.81, 0.89)

 Self-Care

1.46 (0.72)

1.37 (0.60)

1.43 (0.64)

1.40 (0.63)

0.77 (0.71, 0.82)

0.77 (0.71, 0.82)

0.85 (0.79, 0.89)

0.77 (0.71, 0.82)

 Usual Activities

1.82 (0.66)

1.90 (0.72)

1.90 (0.71)

1.88 (0.69)

0.74 (0.67, 0.80)

0.74 (0.67, 0.80)

0.75 (0.66, 0.82)

0.74 (0.67, 0.80)

 Pain / Discomfort

2.25 (0.66)

2.30 (0.69)

2.24 (0.68)

2.20 (0.64)

0.71 (0.64, 0.78)

0.71 (0.64, 0.78)

0.75 (0.66, 0.82)

0.72 (0.64, 0.78)

 Anxiety / Depression

1.77 (0.77)

1.78 (0.81)

1.84 (0.89)

1.81 (0.84)

0.90 (0.87, 0.93)

0.90 (0.87, 0.93)

0.89 (0.85, 0.93)

0.90 (0.87, 0.92)

0–100 VAS: Pain over the Past Week

50.83 (21.32)

51.46 (22.64)

50.28 (21.10)

50.87 (22.34)

0.86 (0.82, 0.89)

0.86 (0.82, 0.89)

0.86 (0.80, 0.90)

0.86 (0.82, 0.89)

11-Point NRS: Pain over the Past Week

5.02 (2.13)

5.06 (2.12)

4.91 (2.16)

5.00 (2.15)

0.95 (0.93, 0.96)

0.95 (0.93, 0.96)

0.96 (0.95, 0.97)

0.95 (0.93, 0.96)

7-Point Likert Scale: Pain over the Past Week

3.83 (0.93)

3.94 (0.98)

3.82 (1.01)

3.83 (0.92)

0.81 (0.75, 0.85)

0.81 (0.75, 0.85)

0.79 (0.72, 0.85)

0.81 (0.75, 0.85)