Primary ciliary dyskinesia (Siewert's / Kartagener's Syndrome): Respiratory symptoms and psycho-social impact

BMC Pulmonary Medicine

Table 1 Regression of the effects of age and time since diagnosis upon symptom scores. Column (1) shows the simple regression of symptom score upon age, without taking time since diagnosis into account.

	Effect of age, without taking time since diagnosis into account (1) b (SE) Sig	Effect of age, taking time since diagnosis into account (2) b (SE) Sig	Effect of time since diagnosis, taking age into account (3) b (SE) Sig
SGRQ-Symptoms	-.750 (.171) p < .001	-.832 (.191) p < .001	.354 (.363) p = .334
SGRQ-Activity	-.500 (.172) p = .005	-.646 (.188) p = .001	.628 (.359) p = .085
SGRQ-Impact	-.465 (.121) p < .001	-.599 (.129) p < .001	.580 (.246) p = .022
SF-36: PCS	-.292 (.105) p = .007	-.328 (.117) p = .007	.159 (.223) p = .480
SF-36: MCS	-.216 (.073) p = .005	-.241 (.082) p = .005	.106 (.156) p = .500

Column (2) shows the regression of symptom score upon age after taking time since diagnosis into account, and column (3) shows the regression of symptom score upon time since diagnosis after taking age into account. The effects in columns (2) and (3) are therefore statistically independent. Regression coefficients are shown as the 'b' (unstandardised) coefficients, along with their standard error (SE) and significance levels (p). Entries in bold have p < .1.

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