|
Reduced NHP38 version obtained through Classical Test Theory (CTT): the NHP20 |
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| Original NHP38 items By dimension |
1st set of criteria for reduction: Discrimination (r) & Endorsement (p) |
2nd set of criteria for reduction: Factor analysis* |
NHP20 |
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|
|
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| Dimension |
No. items |
α |
Items deleted as r < 0.40 |
Items deleted as P < 0.20 |
Items deleted as communality <0.30 |
Items deleted as main loading <0.40 |
Items deleted as difference between similar loadings ≤ 0.1 |
No. Items remaining |
|
|
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| Energy (EN) |
3 |
.76 |
- |
- |
- |
- |
EN2, EN3 |
1 |
| Pain (P) |
8 |
.90 |
- |
P2 |
- |
- |
P4, P5 |
5 |
| Emotional Reactions (EM) |
9 |
.82 |
EM8 |
- |
EM5, EM7 |
- |
- |
6 |
| Sleep (SL) |
5 |
.81 |
SL1 |
- |
- |
- |
- |
4 |
| Social Isolation (SO) |
5 |
.78 |
- |
SO2, SO3 SO4, SO5 |
SO1 |
- |
- |
0 |
| Physical Mobility (PM) |
8 |
.83 |
- |
PM1, PM3 PM8 |
- |
- |
PM6 |
4 |
| Summary Index |
38 |
.95 |
(28 items remaining, α = 0.94) |
20 (α = .92) |
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|
* Principal Axis Extraction (4 factors) and Promax rotation (Factor intercorrelation range: 0.50 – 0.73) NHP items are: EN1-I'm tired all the time; EN2-Everything is an effort; EN3-I soon run out of energy; P1-I have pain at night; P2-I have unbearable pain; P3-I find it painful to change position; P4-I'm in pain when I walk; P5-I'm in pain when I'm standing; P6-I'm in constant pain; P7-I'm in pain when going up/down stairs; P8-I'm in pain when I'm sitting; EM1-Things are getting me down; EM2-I've forgotten to enjoy myself; EM3-I'm feeling on edge; EM4-These days seem to drag; EM5-I lose my temper easily these days; EM6-I feel as if I'm losing control; EM7-Worry is keeping me awake at night; EM8-I feel that life is not worth living; EM9-I wake up feeling depressed; SL1-I take tablets to help me sleep; SL2-I'm waking in the early hours ...; SL3-I lie awake for most of the night; SL4-It takes me long time to get to sleep; SL5-I sleep badly at night; SO1-I feel lonely; SO2-I'm finding it hard to contact people; SO3-I feel there is nobody I am close to; SO4-I feel I am a burden to people; SO5 I'm finding hard to get on with people;PM1-I can only walk about indoors; PM2-I find it hard to bend; PM3-I'm unable to walk at all; PM4-I have trouble getting up/down stairs; PM5-I find it hard to reach for things; PM6-I find it hard to dress myself; PM7-I find it hard to stand for long; PM8-I need help to walk about outside. | ||||||||
Prieto et al. Health and Quality of Life Outcomes 2003 1:27 doi:10.1186/1477-7525-1-27 |
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