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. 2004 Jul 29;2:39. doi: 10.1186/1477-7525-2-39

Table 3.

Mean SF-36 scores at two days

N (% completed) CPU care Routine care Difference 95% CI P-value ρ

Unadjusted

Adjusted
Physical functioning 694 (96.7%) 74.8 69.7 5.1 1.1 to 9.0 0.012 0.002
4.2 0.4 to 7.9 0.029
Social functioning 703 (98.0%) 72.2 69.8 2.4 -1.7 to 6.6 0.252 0
1.5 -2.7 to 5.6 0.49
Role-physical 684 (95.4%) 50.4 46.0 4.4 -2.2 to 11.0 0.191 0.028
3.3 -3.3 to 10.0 0.326
Role-emotional 685 (95.5%) 64.7 59.5 5.2 -1.2 to 11.6 0.113 0
5.1 -1.2 to 11.4 0.111
Mental health 700 (97.6%) 66.9 64.7 2.2 -0.9 to 5.3 0.158 0
2.3 -0.7 to 5.4 0.132
Vitality 697 (97.2%) 52.3 47.6 4.6 1.3 to 8.0 0.007 0
4.6 1.3 to 8.0 0.007
Pain index 701 (97.7%) 50.8 49.0 1.8 -1.9 to 5.5 0.351 0
2.0 -1.7 to 5.7 0.284
General health 688 (96.0%) 60.3 54.5 5.7 2.3 to 9.2 0.001 0
5.4 2.0 to 8.8 0.002

Upper row shows unadjusted analysis (primary analysis) Lower row shows adjusted analysis (secondary analysis) ρ = Intraclass correlation coefficient. This provides a measure of the amount of clustering of each outcome by the unit of randomisation (day).