Table 1.
Questionnaire data means and comparisons between pre-intervention and post-intervention times
| VI Pre-intervention
|
V2 Immediately post-intervention
|
V3 3 months post-intervention
|
Overall P-value | VI × V2
|
VI × V3
|
V2 × V3
|
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | 95% CI | Mean | 95% CI | Mean | 95% CI | VI–V2 | P-value† | VI–V3 | P-value† | V2–V3 | P-value† | ||
| IPQ-R | |||||||||||||
| TL | 18.2 | (17.7–18.6) | 23.9 | (22.4–25.3) | 24.2 | (22.9–254) | <0.0001‡ | −5.7 | <0.0001 | −6.0 | <0.0001 | −0.3 | 0.8 |
| TC | 13.2 | (1 1.3–15.1) | 10.3 | (8.2–12.3) | 10.0 | (7.2–12.7) | <0.0001‡ | 3.0 | 0.001 | 3.3 | <0.0001 | 0.3 | 0.2 |
| C | 14.5 | (13.0–16.0) | 16.4 | (15.6–17.1) | 16.7 | (15.5–17.8) | 0.003 | −1.9 | 0.01 | −2.2 | 0.01 | −0.3 | 0.5 |
| PC | 14.1 | (I3.I–I5.I) | 16.2 | (15.4–16.9) | 15.9 | (15.1–16.7) | 0.002‡ | −2.1 | 0.003 | −1.8 | 0.012 | 0.2 | 0.4 |
| TC | 13.9 | (13.2–14.6) | 16.8 | (15.7–17.8) | 17.0 | (15.8–18.2) | <0.0001‡ | −2.8 | 0.005 | −3.1 | <0.0001 | −0.3 | 0.134 |
| IC | 9.6 | (8.7–10.5) | 12.7 | (12.0–13.4) | 12.7 | (11.8–13.5) | <0.0001‡ | −3.1 | <0.0001 | −3.1 | <0.0001 | 0.1 | 0.8 |
| ET | 13.5 | (12.5–14.4) | 17.5 | (16.9–18.1) | 16.8 | (15.9–17.6) | <0.0001‡ | −4.1 | <0.0001 | −3.3 | <0.0001 | 0.8 | 0.1 |
| PEI | 4.1 | (2.6,5.5) | 6.6 | (4.9–8.3) | 6.7 | (4.9–8.5) | 0.006‡ | −2.6 | 0.008 | −2.7 | 0.012 | −0.1 | 0.4 |
| BMQ | |||||||||||||
| NS | 3.7 | (3.3–4.1) | 3.9 | (3.5–4.2) | 4.1 | (3.8–4.4) | 0.055 | −0.2 | 0.3 | −0.4 | 0.0174 | −0.2 | 0.2 |
| SC | 2.1 | (1.8–2.4) | 2.0 | (1.7–2.2) | 1.9 | (1.6–2.2) | 0.391‡ | 0.2 | 0.2 | 0.2 | 0.3 | 0.1 | 0.8 |
| SFI2 | 41.6 | (40.1–43.2) | 39.2 | (37.0–41.3) | 40.7 | (39.2–42.3) | 0.167‡ | 2.4 | 0.2 | 0.9 | 0.8 | −1.6 | 0.052 |
| GAQ | 10.1 | (8.3–11.9) | 14.1 | (124–15.8) | 13.5 | (11.8–15.1) | <0.0001 | −4.0 | <0.0001 | −3.4 | <0.0001 | 0.7 | 0.3 |
Notes:
Threshold for significance is 5%/2 = 0.025 due to multiple testing of pairwise comparisons;
Friedman’s nonparametric test used for overall P-value, and pairwise comparisons due to normality or sphericity being violated.
Abbreviations: CI, confidence interval; IPQ-R, Revised Illness Perception Questionnaire; TL, timeline; TC, timecycle; C, consequences; PC, personal control; TC, treatment control; IC, illness coherence; ET emotional trauma; PEI, Patient Enablement Instrument; BMQ, Beliefs about Medicine Questionnaire; NS, necessity subscale; CS, concerns subscale; SFI2, Short Form-12; GAQ, Glaucoma Adherence Questionnaire. Knowledge questions only (maximum score 19).