Item | Components | Score distributions | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
None or no response | Once | Twice or more | |||||||||
1 | Past experience of dropout | n | 1,725 | 189 | 117 | ||||||
(%) | 84.9 | 9.3 | 5.8 | ||||||||
2 | Duration of dropout (months) | Mean 14 |
(Standard deviation) (23) |
Mean 6 |
(Interquartile range) (3–18) |
||||||
Item | Components | Mean | Median | Score distributions | |||||||
0 | 1 | 2 | 3 | 4 | 5 | ||||||
3 | Intrapersonal | Negative emotion-frustration | 0.9 | 0 | n | 1,164 | 398 | 198 | 168 | 61 | 42 |
(%) | 57.3 | 19.6 | 9.7 | 8.3 | 3.0 | 2.1 | |||||
4 | Negative emotion-anger | 0.2 | 0 | n | 1,732 | 181 | 63 | 33 | 10 | 12 | |
(%) | 85.3 | 8.9 | 3.1 | 1.6 | 0.5 | 0.6 | |||||
5 | Negative emotion-discomfort | 0.5 | 0 | n | 1,424 | 336 | 125 | 92 | 36 | 18 | |
(%) | 70.1 | 16.5 | 6.2 | 4.5 | 1.8 | 0.9 | |||||
6 | Negative emotion-no improvement | 1.0 | 0 | n | 1,036 | 417 | 208 | 247 | 81 | 42 | |
(%) | 51.0 | 20.5 | 10.2 | 12.2 | 4.0 | 2.1 | |||||
7 | Negative physical state | 0.4 | 0 | n | 1,507 | 293 | 129 | 75 | 17 | 10 | |
(%) | 74.2 | 14.4 | 6.4 | 3.7 | 0.8 | 0.5 | |||||
8 | Positive emotional state | 0.5 | 0 | n | 1,542 | 234 | 93 | 102 | 36 | 24 | |
(%) | 75.9 | 11.5 | 4.6 | 5.0 | 1.8 | 1.2 | |||||
9 | Positive physical state | 0.4 | 0 | n | 1,646 | 216 | 64 | 68 | 19 | 18 | |
(%) | 81.0 | 10.6 | 3.2 | 3.3 | 0.9 | 0.9 | |||||
10 | Testing personal control | 0.9 | 0 | n | 1,130 | 406 | 205 | 206 | 48 | 36 | |
(%) | 55.6 | 20.0 | 10.1 | 10.1 | 2.4 | 1.8 | |||||
11 | Temptation | 0.8 | 0 | n | 1,151 | 445 | 197 | 168 | 37 | 33 | |
(%) | 56.7 | 21.9 | 9.7 | 8.3 | 1.8 | 1.6 | |||||
12 | Environmental | Weather | 0.4 | 0 | n | 1,626 | 216 | 67 | 81 | 24 | 17 |
(%) | 80.1 | 10.6 | 3.3 | 4.0 | 1.2 | 0.8 | |||||
13 | Busyness | 1.2 | 1 | n | 973 | 417 | 221 | 210 | 110 | 100 | |
(%) | 47.9 | 20.5 | 10.9 | 10.3 | 5.4 | 4.9 | |||||
14 | Economic situation | 0.4 | 0 | n | 1,670 | 173 | 65 | 58 | 37 | 28 | |
(%) | 82.2 | 8.5 | 3.2 | 2.9 | 1.8 | 1.4 | |||||
15 | Interpersonal | Conflict | 0.2 | 0 | n | 1,828 | 126 | 28 | 35 | 10 | 4 |
(%) | 90.0 | 6.2 | 1.4 | 1.7 | 0.5 | 0.2 | |||||
16 | Social pressure (direct) | 0.1 | 0 | n | 1,950 | 56 | 11 | 9 | 3 | 2 | |
(%) | 96.0 | 2.8 | 0.5 | 0.4 | 0.1 | 0.1 | |||||
17 | Social pressure (indirect) | 0.1 | 0 | n | 1,948 | 58 | 12 | 10 | 2 | 1 | |
(%) | 95.9 | 2.9 | 0.6 | 0.5 | 0.1 | 0.0 | |||||
18 | Positive emotional state | 0.3 | 0 | n | 1,684 | 209 | 58 | 61 | 11 | 8 | |
(%) | 82.9 | 10.3 | 2.9 | 3.0 | 0.5 | 0.4 | |||||
19 | Positive physical state | 0.1 | 0 | n | 1,849 | 122 | 27 | 28 | 3 | 2 | |
(%) | 91.0 | 6.0 | 1.3 | 1.4 | 0.1 | 0.1 |
Item | Components | Factor 1 | Factor 2 | Factor 3 | Factor 4 | |
---|---|---|---|---|---|---|
3 | Intrapersonal factors |
Negative emotion-frustration | 0.78 | 0.03 | 0.17 | 0.15 |
4 | Negative emotion-anger | 0.69 | 0.21 | 0.20 | 0.06 | |
5 | Negative emotion-discomfort | 0.83 | 0.08 | 0.09 | 0.13 | |
6 | Negative emotion-no improvement | 0.57 | 0.02 | 0.31 | 0.17 | |
7 | Negative physical state | 0.65 | 0.14 | 0.03 | 0.13 | |
8 | Positive emotional state | 0.48 | 0.18 | 0.50 | 0.02 | |
9 | Positive physical state | 0.42 | 0.29 | 0.48 | 0.01 | |
10 | Testing personal control | 0.08 | 0.06 | 0.90 | 0.13 | |
11 | Temptation | 0.16 | 0.09 | 0.87 | 0.15 | |
12 | Environmental factors |
Weather | 0.19 | 0.19 | 0.10 | 0.66 |
13 | Busyness | 0.16 | 0.01 | 0.22 | 0.77 | |
14 | Economic situation | 0.26 | 0.22 | 0.13 | 0.46 | |
15 | Interpersonal factors |
Conflict | 0.20 | 0.60 | 0.04 | 0.37 |
16 | Social pressure (direct) | 0.09 | 0.82 | 0.08 | 0.05 | |
17 | Social pressure (indirect) | 0.08 | 0.83 | 0.11 | 0.12 | |
18 | Positive emotional state | 0.05 | 0.35 | 0.13 | 0.66 | |
19 | Positive physical state | 0.07 | 0.56 | 0.14 | 0.50 | |
Labeled name | Negative perceptions for regular visits |
Social pressure |
Lack of perceived necessity |
Environmental obstacles |
||
Eigenvalues | 5.66 | 2.01 | 1.36 | 1.12 | ||
Percentage of total variance | 18.6 | 14.4 | 13.8 | 13.0 | ||
Number of test measures | 4 | 2 | 2 | 3 |
Detected factor |
Retained items | Name | Composite score | Mean | Median | Score distributions | |||||
---|---|---|---|---|---|---|---|---|---|---|---|
0 | 0< to 1 | 1< to 2 | 2< to 3 | 3< | |||||||
1 | 3, 4, 5, and 7 | Negative perceptions for regular visits |
Averaging the scores of Items 3, 4, 5, and 7 |
0.5 | 0.25 | n | 978 | 705 | 242 | 76 | 30 |
(%) | 48.2 | 34.7 | 11.9 | 3.7 | 1.5 | ||||||
2 | 16 and 17 | Social pressure | Averaging the scores of Items 16 and 17 |
0.1 | 0 | n | 1,926 | 73 | 17 | 15 | 0 |
(%) | 94.8 | 3.6 | 0.8 | 0.7 | 0 | ||||||
3 | 10 and 11 | Lack of perceived necessity |
Averaging the scores of Items 10 and 11 |
0.9 | 0.5 | n | 1,012 | 490 | 271 | 181 | 77 |
(%) | 49.8 | 24.1 | 13.3 | 8.9 | 3.8 | ||||||
4 | 12, 13, and 18 | Environmental obstacles | Averaging the scores of Items 12, 13, and 18 |
0.6 | 0.33 | n | 926 | 701 | 276 | 88 | 40 |
(%) | 45.6 | 34.5 | 13.6 | 4.3 | 2.0 |
The composite score (0–5) |
Number of patients |
Number of dropouts |
Person- years |
Incidence rate (per 1,000 person-years) |
Crude HR |
(95% CI) | Adjusted HRa |
(95% CI) | Adjusted HRb |
(95% CI) | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Median | Range | |||||||||||
Factor 1: Negative perceptions for regular visits (Categorical) |
||||||||||||
Low | 0 | 0 | 978 | 53 | 1017 | 52.1 | 1.00 | ref | 1.00 | ref | 1.00 | ref |
Intermediate | 0.25 | 0.25–0.5 | 465 | 26 | 481 | 54.0 | 1.03 | (0.65–1.65) | 1.03 | (0.64–1.66) | 0.89 | (0.55–1.45) |
High | 1.25 | 0.75–4.5 | 588 | 46 | 593 | 77.6 | 1.49 | (1.00–2.21) | 1.46 | (0.97–2.18) | 1.06 | (0.68–1.65) |
(Continuous) One-point increase in the composite score |
1.23 | (1.01–1.50) | 1.25 | (1.02–1.54) | 1.07 | (0.85–1.35) | ||||||
Factor 3: Lack of perceived necessity (Categorical) |
||||||||||||
Low | 0 | 0 | 1,012 | 45 | 1053 | 42.7 | 1.00 | ref | 1.00 | ref | 1.00 | ref |
Intermediate | 1.0 | 0.5–1.0 | 490 | 32 | 506 | 63.3 | 1.4799 | (0.94–2.33) | 1.38 | (0.87–2.18) | 1.26 | (0.79–2.02) |
High | 2.0 | 1.5–5.0 | 529 | 48 | 532 | 90.2 | 2.11 | (1.41–3.17) | 1.89 | (1.25–2.88) | 1.59 | (1.00–2.51) |
(Continuous) One-point increase in the composite score |
1.30 | (1.15–1.48) | 1.26 | (1.10–1.44) | 1.20 | (1.04–1.39) | ||||||
Factor 4: Environmental obstacles (Categorical) |
||||||||||||
Low | 0 | 0 | 926 | 38 | 965 | 39.4 | 1.00 | ref | 1.00 | ref | 1.00 | ref |
Intermediate | 0.33 | 0.33–0.67 | 514 | 35 | 532 | 65.8 | 1.67 | (1.05–2.64) | 1.57 | (0.99–2.50) | 1.52 | (0.95–2.43) |
High | 1.67 | 1.0–5.0 | 591 | 52 | 594 | 87.5 | 2.22 | (1.46–3.38) | 2.03 | (1.32–3.12) | 1.72 | (1.08–2.74) |
(Continuous) One-point increase in the composite score |
1.31 | (1.11–1.56) | 1.27 | (1.06–1.52) | 1.15 | (0.94–1.40) |
Assinged to intervention group | p for interaction |
||||
---|---|---|---|---|---|
Yes (n = 872) | No (n = 1,159) | ||||
Adjusted HR |
(95% CI) | Adjusted HRa |
(95% CI) | ||
Facor 1: Negative perceptions for regular visits | 0.504 | ||||
Low | 1.00 | ref | 1.00 | ref | |
Intermediate | 1.69 | (0.66–4.32) | 0.87 | (0.50–1.52) | |
High | 1.73 | (0.69–4.36) | 1.42 | (0.90–2.22) | |
Factor 3: Lack of perceived necessity | 0.499 | ||||
Low | 1.00 | ref | 1.00 | ref | |
Intermediate | 1.18 | (0.39–3.57) | 1.46 | (0.88–2.43) | |
High | 2.71 | (1.12–6.60) | 1.74 | (1.08–2.81) | |
Factor 4: Environmental obstacles | 0.724 | ||||
Low | 1.00 | ref | 1.00 | ref | |
Intermediate | 1.32 | (0.45–3.87) | 1.61 | (0.96–2.70) | |
High | 2.69 | (1.08–6.73) | 1.93 | (1.18–3.14) |