Comparison of baseline characteristics between patients with or without missing primary outcome data

C Salisbury; NE Foster; C Hopper; A Bishop; S Hollinghurst; J Coast; S Kaur; J Pearson; A Franchini; J Hall; S Grove; M Calnan; J Busby; AA Montgomery

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Salisbury C, Foster NE, Hopper C, et al. A pragmatic randomised controlled trial of the effectiveness and cost-effectiveness of ‘PhysioDirect’ telephone assessment and advice services for physiotherapy. Southampton (UK): NIHR Journals Library; 2013 Jan. (Health Technology Assessment, No. 17.2.)

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A pragmatic randomised controlled trial of the effectiveness and cost-effectiveness of ‘PhysioDirect’ telephone assessment and advice services for physiotherapy.

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Appendix 1Comparison of baseline characteristics between patients with or without missing primary outcome data

TABLE 62

Comparison for both trial arms of baseline demographic characteristics between patients whose primary outcome (SF-36v2 at 6 months) was collected and those for whom that outcome information was missing

Patient characteristics at baseline	Randomised: n = 2249^a (100%)
	Usual care: n = 743 (33.04%)			PhysioDirect: n = 1506 (66.96%)
	Collected: n = 629 (84.66%)	Missing: n = 114 (15.34%)	Test	Collected: n = 1283 (85.19%)	Missing: n = 223 (14.81%)	Test
Sex: %
Female	59.46	56.14	x₁² = 0.44, p = 0.51	60.02	56.95	x₁² = 0.74, p = 0.39
Male	40.54	43.86	x₁² = 0.44, p = 0.51	39.98	43.05	x₁² = 0.74, p = 0.39
Age: median (IQR)
Years	50.12 (38.32 to 62.69)	39.72 (29.07 to 51.66)	Rank-sum, z = 5.4, p < 0.001	50.01 (38.25 to 62.28)	40.11 (29.22 to 51.69)	Rank-sum, z = 7.40, p < 0.001
Ethnicity: %
White	95.83	95.54	x₅² = 6.83, p = 0.23	97.07	94.59	x₅² = 8.72, p = 0.12
Black	1.12	0.89		0.79	1.35
Asian	1.76	0.89		0.71	2.70
Dual/mixed	0.96	0.89		0.71	0.90
Chinese	0.00	0.89		0.16	0.00
Other	0.32	0.89		0.55	0.45
Deprivation: %
Quintile (5 = most deprived)
1	9.85	10.28	x₄² = 14.97, p = 0.01	10.36	11.79	x₄² = 24.28, p < 0.001
2	22.50	12.15		20.31	15.57
3	29.89	26.17		28.96	22.17
4	21.84	21.50		23.41	19.81
5	15.93	29.91		16.97	30.66
Employment status: %
Employed	56.91	57.80	x₅² = 46.94, p < 0.001	61.15	67.42	x₅² = 40.39, p < 0.001
Unemployed	4.02	18.35		3.78	9.95
Student	2.73	1.83		2.36	3.62
Ill/disabled	6.91	8.26		5.36	6.79
Retired	24.76	6.42		22.70	7.24
Not working/other	4.66	7.34		4.65	4.98
Profession: %
Administrative	17.05	16.09	x₈² = 19.11, p = 0.01	14.70	6.91	x₈² = 31.06, p < 0.001
Technical	11.74	4.60		11.91	10.64
Elementary	8.71	9.20		9.40	14.89
Manager	9.47	17.24		8.74	12.77
Personal services	7.39	6.90		8.74	12.77
Operatives	4.55	11.49		5.77	4.79
Professional	18.75	10.34		19.44	9.57
Customer services	10.61	14.94		10.42	15.96
Skilled trade	11.74	9.20		10.88	11.70

a: Excluding seven post-randomisation exclusions.

TABLE 63

Comparison for both trial arms of baseline characteristics related to physiotherapy service between patients whose primary outcome (SF-36v2 at 6 months) was collected and those for whom that outcome information was missing

Patient characteristics at baseline	Randomised: n = 2249 (100%)
	Usual care: n = 743 (33.04%)			PhysioDirect: n = 1506 (66.96%)
	Collected: n = 629 (84.66%)	Missing: n = 114 (15.34%)	Test	Collected: n = 1283 (85.19%)	Missing: n = 223 (14.81%)	Test
Referral problem (%)
Cervical	11.62	14.04	x₇² = 8.83, p = 0.27	12.00	13.90	x₇² = 7.20, p = 0.41
Thoracic	1.43	3.51		2.26	2.69
Lumbar	26.43	32.46		26.89	30.04
Upper limb	23.89	21.05		23.46	22.42
Lower limb	31.69	22.81		30.71	25.11
Widespread pain	0.80	1.75		0.62	0.00
Multiple MSK	3.50	4.39		3.51	4.48
Other MSK	0.64	0.00		0.55	1.35
PCT (%)
Bristol	34.34	30.70	x₃² = 14.13, p < 0.01	34.29	26.46	x₃² = 35.17, p < 0.001
Somerset	24.17	11.40		24.94	12.56
Cheshire	21.62	33.33		21.43	34.98
Stoke	19.87	24.56		19.33	26.01
Physiotherapy preference (%)
Usual care	32.15	37.50	x₂² = 1.31, p = 0.52	29.66	36.70	x₂² = 35.17, p = 0.06
PhysioDirect	35.54	33.93		36.66	29.36
No preference	32.31	28.57		33.68	33.94
Time off work: mean (SD), median (IRQ)
Days	4.31 (9.10), 0 (0–4)	5.08 (8.11), 0 (0–10)	Rank-sum, z = –1.17, p = 0.24	3.94 (8.42), 0 (0-4)	5.14 (9.19), 0 (0-7)	Rank-sum, z = –1.34, p = 0.18
English native speaker: %
No	2.60	4.42	x₁² = 1.14, p = 0.29	3.49	4.50	x₁² = 0.55, p = 0.46
Yes	97.40	95.58	x₁² = 1.14, p = 0.29	96.51	95.50	x₁² = 0.55, p = 0.46
Telephone: %
No	0.16	2.65	x₁² = 11.11, p < 0.01	0.63	2.69	x₁² = 8.73, p < 0.01
Yes	99.84	97.35	x₁² = 11.11, p < 0.01	99.37	97.31	x₁² = 8.73, p < 0.01
Car: %
No	15.50	26.36	x₁² = 7.79, p < 0.01	15.96	21.08	x₁² = 3.57, p = 0.06
Yes	84.50	73.64	x₁² = 7.79, p < 0.01	84.04	78.92	x₁² = 3.57, p = 0.06

TABLE 64

Comparison for both trial arms of outcome baseline measures between patients whose primary outcome (SF-36v2 at 6 months) was collected and those for whom that outcome information was missing

Patient outcome measures at baseline	Randomised patients: n = 2249 (100%)
	Usual care: n = 743 (33.04%)			PhysioDirect: n = 1506 (66.96%)
	Collected: n = 629 (84.66%)	Missing: n = 114 (15.34%)	Test	Collected: n = 1283 (85.19%)	Missing: n = 223 (14.81%)	Test
SF-36v2 PCS
Mean (SD)	37.97 (8.66)	36.31 (8.32)	Rank-sum, z = 2.11, p = 0.03	36.98 (8.92)	35.81 (8.59)	Rank-sum, z = 1.93, p = 0.05
Median (IQR)	38.06 (31.85 to 44.38)	36.09 (29.45 to 42.34)	Rank-sum, z = 2.11, p = 0.03	37.15 (30.55 to 43.38)	35.47 (30.12 to 41.40)	Rank-sum, z = 1.93, p = 0.05
SF-36v2 MCS
Mean (SD)	46.42 (13.08)	41.47 (13.69)	Rank-sum, z = 3.64, p < 0.001	46.76 (12.34)	42.10 (13.68)	Rank-sum, z = 4.73, p < 0.001
Median (IQR)	49.38 (36.89 to 56.85)	40.71 (33.01 to 53.83)	Rank-sum, z = 3.64, p < 0.001	49.39 (37.48 to 56.86)	43.32 (31.75 to 53.63)	Rank-sum, z = 4.73, p < 0.001
MYMOP
Mean (SD)	3.76 (0.99)	4.06 (0.94)	Rank-sum, z = –3.17, p < 0.01	3.79 (0.99)	4.13 (0.95)	Rank-sum, z = –4.30, p < 0.001
Median (IQR)	3.76 (0.99)	4.06 (0.94)		3.79 (0.99)	4.13 (0.95)
Lower better	3.75 (3.25 to 4.33)	4.00 (3.50 to 4.67)		3.75 (3.25 to 4.50)	4.00 (3.50 to 4.75)
EQ-5D
Mean (SD)	0.57 (0.28)	0.46 (0.32)	Rank-sum, z = 3.47, p < 0.001	0.54 (0.29)	0.45 (0.32)	Rank-sum, z = 4.28, p < 0.001
Median (IQR)	0.69 (0.52 to 0.76)	0.62 (0.16 to 0.69)	Rank-sum, z = 3.47, p < 0.001	0.69 (0.26 to 0.76)	0.62 (0.12 to 0.69)	Rank-sum, z = 4.28, p < 0.001

Copyright © Queen's Printer and Controller of HMSO 2013. This work was produced by Salisbury et al. under the terms of a commissioning contract issued by the Secretary of State for Health. This issue may be freely reproduced for the purposes of private research and study and extracts (or indeed, the full report) may be included in professional journals provided that suitable acknowledgement is made and the reproduction is not associated with any form of advertising. Applications for commercial reproduction should be addressed to: NIHR Journals Library, National Institute for Health Research, Evaluation, Trials and Studies Coordinating Centre, Alpha House, University of Southampton Science Park, Southampton SO16 7NS, UK.

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Salisbury C, Foster NE, Hopper C, et al. A pragmatic randomised controlled trial of the effectiveness and cost-effectiveness of ‘PhysioDirect’ telephone assessment and advice services for physiotherapy. Southampton (UK): NIHR Journals Library; 2013 Jan. (Health Technology Assessment, No. 17.2.) Appendix 1, Comparison of baseline characteristics between patients with or without missing primary outcome data.
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