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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: J Pain Symptom Manage. 2019 Jan 24;57(5):980–988.e9. doi: 10.1016/j.jpainsymman.2019.01.008

Appendix 2.

Item by item correlation analysis

Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Item 8 Item 9 Item 10
Item 1 1.000 .734 .672 .514 .448 .516 .516 .379 .476 .500
Item 2 .734 1.000 .715 .563 .576 .495 .549 .526 .582 .454
Item 3 .672 .715 1.000 .450 .441 .517 .559 .516 .532 .464
Item 4 .514 .563 .450 1.000 .744 .589 .431 .367 .454 .539
Item 5 .448 .576 .441 .744 1.000 .735 .429 .440 .508 .459
Item 6 .516 .495 .517 .589 .735 1.000 .494 .469 .544 .519
Item 7 .516 .549 .559 .431 .429 .494 1.000 .892 .738 .516
Item 8 .379 .526 .516 .367 .440 .469 .892 1.000 .792 .454
Item 9 .476 .582 .532 .454 .508 .544 .738 .792 1.000 .472
Item 10 .500 .454 .464 .539 .459 .519 .516 .454 .472 1.000
Item 11 .386 .423 .462 .590 .608 .602 .504 .494 .537 .742
Item 12 .395 .368 .423 .493 .537 .767 .543 .531 .636 .667
Item 13 .570 .487 .523 .568 .573 .597 .467 .394 .519 .713
Item 14 .475 .478 .445 .487 .513 .611 .611 .544 .566 .581
Item 15 .420 .433 .318 .525 .677 .669 .499 .481 .473 .436
Item 16 .398 .460 .421 .469 .615 .768 .509 .499 .558 .445
Item 17 .408 .477 .214 .306 .453 .362 .442 .401 .446 .292
Item 18 .451 .466 .374 .481 .640 .621 .610 .527 .540 .401
Item 19 .390 .469 .322 .386 .565 .562 .539 .508 .628 .327
Item 20 .504 .536 .493 .420 .446 .644 .543 .492 .516 .559
Item 21 .535 .626 .562 .468 .562 .654 .514 .429 .499 .487
Item 22 .473 .541 .434 .432 .562 .733 .492 .461 .518 .475
Item 23 .552 .478 .445 .512 .553 .610 .450 .406 .512 .612
Item 24 .539 .600 .580 .510 .630 .714 .550 .472 .463 .567
Item 25 .453 .481 .481 .500 .669 .697 .537 .462 .502 .353
Item 26 .507 .525 .404 .468 .642 .797 .477 .467 .565 .415
Item 27 .502 .583 .434 .421 .531 .507 .497 .492 .526 .414
Item 28 .558 .578 .590 .595 .770 .794 .665 .638 .727 .554
Item 29 .421 .525 .473 .461 .687 .719 .593 .627 .803 .481
Item 30 .462 .560 .505 .507 .507 .695 .510 .494 .531 .671
Item 31 .505 .523 .519 .556 .595 .772 .493 .422 .471 .591
Item 32 .487 .557 .489 .472 .598 .756 .441 .448 .516 .530
Item 33 .518 .473 .515 .425 .520 .582 .390 .348 .465 .566
Item 34 .540 .491 .539 .451 .548 .584 .520 .436 .388 .351
Item 35 .364 .432 .411 .512 .660 .688 .517 .400 .505 .336
Item 36 .410 .464 .410 .469 .646 .658 .582 .468 .542 .503
Item 37 .384 .364 .376 .415 .597 .611 .530 .432 .462 .470
Item 38 .356 .450 .336 .406 .626 .700 .518 .475 .517 .467
Item 39 .451 .522 .357 .239 .393 .399 .443 .403 .393 .431
Item 40 .451 .508 .495 .427 .613 .601 .636 .522 .575 .411
Item 41 .419 .488 .446 .320 .548 .565 .595 .484 .647 .347
Item 42 .549 .542 .599 .554 .617 .668 .518 .443 .487 .733
Item 43 .450 .478 .475 .438 .567 .610 .410 .372 .449 .462
Item 44 .495 .555 .528 .484 .619 .702 .447 .421 .506 .457
Item 45 .526 .478 .530 .446 .552 .631 .431 .414 .462 .628
Item 46 .350 .501 .416 .375 .472 .557 .658 .632 .665 .439
Item 47 .395 .470 .493 .417 .539 .621 .429 .461 .497 .447
Item 11 Item 12 Item 13 Item 14 Item 15 Item 16 Item 17 Item 18 Item 19 Item 20
Item 1 .386 .395 .570 .475 .420 .398 .408 .451 .390 .504
Item 2 .423 .368 .487 .478 .433 .460 .477 .466 .469 .536
Item 3 .462 .423 .523 .445 .318 .421 .214 .374 .322 .493
Item 4 .590 .493 .568 .487 .525 .469 .306 .481 .386 .420
Item 5 .608 .537 .573 .513 .677 .615 .453 .640 .565 .446
Item 6 .602 .767 .597 .611 .669 .768 .362 .621 .562 .644
Item 7 .504 .543 .467 .611 .499 .509 .442 .610 .539 .543
Item 8 .494 .531 .394 .544 .481 .499 .401 .527 .508 .492
Item 9 .537 .636 .519 .566 .473 .558 .446 .540 .628 .516
Item 10 .742 .667 .713 .581 .436 .445 .292 .401 .327 .559
Item 11 1.000 .770 .666 .575 .531 .462 .132 .358 .299 .486
Item 12 .770 1.000 .617 .595 .572 .671 .149 .414 .450 .516
Item 13 .666 .617 1.000 .539 .521 .518 .309 .520 .430 .612
Item 14 .575 .595 .539 1.000 .746 .702 .530 .719 .636 .744
Item 15 .531 .572 .521 .746 1.000 .806 .467 .788 .634 .671
Item 16 .462 .671 .518 .702 .806 1.000 .488 .688 .693 .689
Item 17 .132 .149 .309 .530 .467 .488 1.000 .683 .669 .579
Item 18 .358 .414 .520 .719 .788 .688 .683 1.000 .874 .727
Item 19 .299 .450 .430 .636 .634 .693 .669 .874 1.000 .664
Item 20 .486 .516 .612 .744 .671 .689 .579 .727 .664 1.000
Item 21 .591 .517 .577 .665 .643 .623 .433 .669 .637 .792
Item 22 .551 .699 .464 .688 .740 .813 .415 .668 .695 .781
Item 23 .549 .521 .896 .526 .643 .598 .428 .661 .578 .722
Item 24 .489 .489 .499 .678 .654 .705 .622 .635 .515 .743
Item 25 .482 .507 .467 .574 .722 .767 .508 .608 .544 .591
Item 26 .434 .668 .484 .563 .753 .865 .388 .640 .654 .578
Item 27 .289 .326 .370 .523 .420 .517 .848 .559 .522 .551
Item 28 .607 .699 .638 .691 .724 .730 .472 .776 .712 .609
Item 29 .543 .724 .570 .618 .559 .738 .487 .643 .779 .569
Item 30 .590 .620 .616 .669 .565 .668 .498 .554 .494 .884
Item 31 .688 .726 .531 .508 .662 .682 .250 .500 .442 .638
Item 32 .621 .764 .506 .558 .625 .781 .318 .519 .571 .659
Item 33 .524 .484 .798 .356 .524 .494 .301 .477 .401 .646
Item 34 .387 .389 .405 .235 .364 .458 .409 .445 .386 .460
Item 35 .422 .486 .427 .435 .593 .686 .391 .590 .510 .526
Item 36 .528 .576 .444 .535 .557 .651 .516 .535 .482 .596
Item 37 .543 .618 .422 .411 .548 .593 .279 .431 .420 .483
Item 38 .508 .644 .423 .519 .664 .744 .316 .542 .524 .523
Item 39 .257 .234 .305 .375 .316 .350 .746 .478 .383 .522
Item 40 .412 .440 .487 .420 .537 .555 .549 .748 .663 .601
Item 41 .360 .487 .462 .420 .493 .595 .530 .665 .692 .526
Item 42 .747 .674 .747 .579 .550 .499 .321 .453 .311 .636
Item 43 .547 .559 .534 .330 .548 .502 .271 .403 .303 .458
Item 44 .513 .597 .526 .398 .551 .632 .315 .443 .416 .531
Item 45 .585 .528 .760 .494 .617 .552 .298 .572 .443 .697
Item 46 .455 .455 .424 .532 .587 .617 .410 .670 .575 .579
Item 47 .605 .588 .438 .353 .536 .491 .231 .361 .299 .508
Item 20 Item 21 Item 22 Item 23 Item 24 Item 25 Item 26 Item 27 Item 28 Item 29
Item 1 .504 .535 .473 .552 .539 .453 .507 .502 .558 .421
Item 2 .536 .626 .541 .478 .600 .481 .525 .583 .578 .525
Item 3 .493 .562 .434 .445 .580 .481 .404 .434 .590 .473
Item 4 .420 .468 .432 .512 .510 .500 .468 .421 .595 .461
Item 5 .446 .562 .562 .553 .630 .669 .642 .531 .770 .687
Item 6 .644 .654 .733 .610 .714 .697 .797 .507 .794 .719
Item 7 .543 .514 .492 .450 .550 .537 .477 .497 .665 .593
Item 8 .492 .429 .461 .406 .472 .462 .467 .492 .638 .627
Item 9 .516 .499 .518 .512 .463 .502 .565 .526 .727 .803
Item 10 .559 .487 .475 .612 .567 .353 .415 .414 .554 .481
Item 11 .486 .591 .551 .549 .489 .482 .434 .289 .607 .543
Item 12 .516 .517 .699 .521 .489 .507 .668 .326 .699 .724
Item 13 .612 .577 .464 .896 .499 .467 .484 .370 .638 .570
Item 14 .744 .665 .688 .526 .678 .574 .563 .523 .691 .618
Item 15 .671 .643 .740 .643 .654 .722 .753 .420 .724 .559
Item 16 .689 .623 .813 .598 .705 .767 .865 .517 .730 .738
Item 17 .579 .433 .415 .428 .622 .508 .388 .848 .472 .487
Item 18 .727 .669 .668 .661 .635 .608 .640 .559 .776 .643
Item 19 .664 .637 .695 .578 .515 .544 .654 .522 .712 .779
Item 20 1.000 .792 .781 .722 .743 .591 .578 .551 .609 .569
Item 21 .792 1.000 .818 .614 .672 .587 .602 .441 .625 .596
Item 22 .781 .818 1.000 .522 .633 .591 .783 .428 .635 .669
Item 23 .722 .614 .522 1.000 .572 .572 .571 .424 .662 .567
Item 24 .743 .672 .633 .572 1.000 .842 .659 .721 .658 .546
Item 25 .591 .587 .591 .572 .842 1.000 .751 .578 .669 .587
Item 26 .578 .602 .783 .571 .659 .751 1.000 .448 .706 .716
Item 27 .551 .441 .428 .424 .721 .578 .448 1.000 .620 .596
Item 28 .609 .625 .635 .662 .658 .669 .706 .620 1.000 .850
Item 29 .569 .596 .669 .567 .546 .587 .716 .596 .850 1.000
Item 30 .884 .734 .736 .650 .795 .565 .544 .615 .614 .606
Item 31 .638 .741 .785 .561 .732 .706 .713 .366 .634 .549
Item 32 .659 .760 .922 .501 .614 .561 .790 .415 .636 .696
Item 33 .646 .620 .472 .840 .563 .557 .484 .385 .585 .503
Item 34 .460 .458 .443 .429 .605 .648 .486 .552 .531 .452
Item 35 .526 .515 .567 .491 .679 .784 .655 .419 .624 .564
Item 36 .596 .535 .590 .441 .745 .733 .579 .544 .615 .572
Item 37 .483 .444 .565 .416 .603 .675 .563 .314 .549 .532
Item 38 .523 .463 .687 .477 .582 .635 .710 .346 .643 .606
Item 39 .522 .383 .347 .352 .699 .464 .311 .771 .445 .398
Item 40 .601 .597 .520 .569 .658 .627 .563 .560 .729 .651
Item 41 .526 .532 .519 .512 .612 .638 .632 .511 .689 .720
Item 42 .636 .624 .536 .657 .691 .573 .429 .447 .647 .518
Item 43 .458 .570 .549 .528 .620 .623 .566 .390 .509 .460
Item 44 .531 .631 .664 .511 .655 .642 .659 .416 .570 .576
Item 45 .697 .595 .541 .832 .634 .518 .512 .345 .624 .495
Item 46 .579 .564 .591 .544 .615 .593 .589 .431 .643 .571
Item 47 .508 .506 .543 .492 .638 .674 .551 .393 .532 .479
Item 29 Item 30 Item 31 Item 32 Item 33 Item 34 Item 35 Item 36 Item 37 Item 38 Item 39
Item 1 .421 .462 .505 .487 .518 .540 .364 .410 .384 .356 .451
Item 2 .525 .560 .523 .557 .473 .491 .432 .464 .364 .450 .522
Item 3 .473 .505 .519 .489 .515 .539 .411 .410 .376 .336 .357
Item 4 .461 .507 .556 .472 .425 .451 .512 .469 .415 .406 .239
Item 5 .687 .507 .595 .598 .520 .548 .660 .646 .597 .626 .393
Item 6 .719 .695 .772 .756 .582 .584 .688 .658 .611 .700 .399
Item 7 .593 .510 .493 .441 .390 .520 .517 .582 .530 .518 .443
Item 8 .627 .494 .422 .448 .348 .436 .400 .468 .432 .475 .403
Item 9 .803 .531 .471 .516 .465 .388 .505 .542 .462 .517 .393
Item 10 .481 .671 .591 .530 .566 .351 .336 .503 .470 .467 .431
Item 11 .543 .590 .688 .621 .524 .387 .422 .528 .543 .508 .257
Item 12 .724 .620 .726 .764 .484 .389 .486 .576 .618 .644 .234
Item 13 .570 .616 .531 .506 .798 .405 .427 .444 .422 .423 .305
Item 14 .618 .669 .508 .558 .356 .235 .435 .535 .411 .519 .375
Item 15 .559 .565 .662 .625 .524 .364 .593 .557 .548 .664 .316
Item 16 .738 .668 .682 .781 .494 .458 .686 .651 .593 .744 .350
Item 17 .487 .498 .250 .318 .301 .409 .391 .516 .279 .316 .746
Item 18 .643 .554 .500 .519 .477 .445 .590 .535 .431 .542 .478
Item 19 .779 .494 .442 .571 .401 .386 .510 .482 .420 .524 .383
Item 20 .569 .884 .638 .659 .646 .460 .526 .596 .483 .523 .522
Item 21 .596 .734 .741 .760 .620 .458 .515 .535 .444 .463 .383
Item 22 .669 .736 .785 .922 .472 .443 .567 .590 .565 .687 .347
Item 23 .567 .650 .561 .501 .840 .429 .491 .441 .416 .477 .352
Item 24 .546 .795 .732 .614 .563 .605 .679 .745 .603 .582 .699
Item 25 .587 .565 .706 .561 .557 .648 .784 .733 .675 .635 .464
Item 26 .716 .544 .713 .790 .484 .486 .655 .579 .563 .710 .311
Item 27 .596 .615 .366 .415 .385 .552 .419 .544 .314 .346 .771
Item 28 .850 .614 .634 .636 .585 .531 .624 .615 .549 .643 .445
Item 29 1.000 .606 .549 .696 .503 .452 .564 .572 .532 .606 .398
Item 30 .606 1.000 .740 .731 .645 .486 .552 .652 .548 .555 .590
Item 31 .549 .740 1.000 .838 .642 .563 .672 .668 .689 .653 .415
Item 32 .696 .731 .838 1.000 .505 .460 .537 .584 .589 .676 .332
Item 33 .503 .645 .642 .505 1.000 .499 .531 .473 .484 .415 .376
Item 34 .452 .486 .563 .460 .499 1.000 .639 .682 .647 .512 .621
Item 35 .564 .552 .672 .537 .531 .639 1.000 .843 .792 .735 .418
Item 36 .572 .652 .668 .584 .473 .682 .843 1.000 .859 .798 .613
Item 37 .532 .548 .689 .589 .484 .647 .792 .859 1.000 .787 .415
Item 38 .606 .555 .653 .676 .415 .512 .735 .798 .787 1.000 .350
Item 39 .398 .590 .415 .332 .376 .621 .418 .613 .415 .350 1.000
Item 40 .651 .574 .584 .499 .583 .686 .701 .685 .635 .552 .675
Item 41 .720 .488 .566 .510 .529 .560 .681 .671 .617 .556 .635
Item 42 .518 .749 .758 .600 .782 .506 .557 .656 .649 .526 .504
Item 43 .460 .563 .736 .622 .635 .586 .577 .602 .706 .551 .475
Item 44 .576 .642 .800 .735 .648 .594 .688 .673 .689 .641 .471
Item 45 .495 .705 .645 .566 .811 .483 .504 .535 .555 .577 .442
Item 46 .571 .602 .575 .534 .474 .473 .648 .530 .492 .581 .454
Item 47 .479 .604 .761 .614 .618 .573 .593 .598 .708 .553 .466
Item 40 Item 41 Item 42 Item 43 Item 44 Item 45 Item 46 Item 47
Item 1 .451 .419 .549 .450 .495 .526 .350 .395
Item 2 .508 .488 .542 .478 .555 .478 .501 .470
Item 3 .495 .446 .599 .475 .528 .530 .416 .493
Item 4 .427 .320 .554 .438 .484 .446 .375 .417
Item 5 .613 .548 .617 .567 .619 .552 .472 .539
Item 6 .601 .565 .668 .610 .702 .631 .557 .621
Item 7 .636 .595 .518 .410 .447 .431 .658 .429
Item 8 .522 .484 .443 .372 .421 .414 .632 .461
Item 9 .575 .647 .487 .449 .506 .462 .665 .497
Item 10 .411 .347 .733 .462 .457 .628 .439 .447
Item 11 .412 .360 .747 .547 .513 .585 .455 .605
Item 12 .440 .487 .674 .559 .597 .528 .455 .588
Item 13 .487 .462 .747 .534 .526 .760 .424 .438
Item 14 .420 .420 .579 .330 .398 .494 .532 .353
Item 15 .537 .493 .550 .548 .551 .617 .587 .536
Item 16 .555 .595 .499 .502 .632 .552 .617 .491
Item 17 .549 .530 .321 .271 .315 .298 .410 .231
Item 18 .748 .665 .453 .403 .443 .572 .670 .361
Item 19 .663 .692 .311 .303 .416 .443 .575 .299
Item 20 .601 .526 .636 .458 .531 .697 .579 .508
Item 21 .597 .532 .624 .570 .631 .595 .564 .506
Item 22 .520 .519 .536 .549 .664 .541 .591 .543
Item 23 .569 .512 .657 .528 .511 .832 .544 .492
Item 24 .658 .612 .691 .620 .655 .634 .615 .638
Item 25 .627 .638 .573 .623 .642 .518 .593 .674
Item 26 .563 .632 .429 .566 .659 .512 .589 .551
Item 27 .560 .511 .447 .390 .416 .345 .431 .393
Item 28 .729 .689 .647 .509 .570 .624 .643 .532
Item 29 .651 .720 .518 .460 .576 .495 .571 .479
Item 30 .574 .488 .749 .563 .642 .705 .602 .604
Item 31 .584 .566 .758 .736 .800 .645 .575 .761
Item 32 .499 .510 .600 .622 .735 .566 .534 .614
Item 33 .583 .529 .782 .635 .648 .811 .474 .618
Item 34 .686 .560 .506 .586 .594 .483 .473 .573
Item 35 .701 .681 .557 .577 .688 .504 .648 .593
Item 36 .685 .671 .656 .602 .673 .535 .530 .598
Item 37 .635 .617 .649 .706 .689 .555 .492 .708
Item 38 .552 .556 .526 .551 .641 .577 .581 .553
Item 39 .675 .635 .504 .475 .471 .442 .454 .466
Item 40 1.000 .910 .571 .604 .622 .589 .647 .582
Item 41 .910 1.000 .494 .586 .644 .520 .565 .558
Item 42 .571 .494 1.000 .695 .676 .756 .448 .719
Item 43 .604 .586 .695 1.000 .867 .712 .471 .875
Item 44 .622 .644 .676 .867 1.000 .682 .496 .759
Item 45 .589 .520 .756 .712 .682 1.000 .548 .679
Item 46 .647 .565 .448 .471 .496 .548 1.000 .519
Item 47 .582 .558 .719 .875 .759 .679 .519 1.000