Array ( [urn:ac.highwire.org:guest:identity] => Array ( [runtime-id] => urn:ac.highwire.org:guest:identity [type] => guest [service-id] => ajnr-ac.highwire.org [access-type] => Controlled [privilege] => Array ( [urn:ac.highwire.org:guest:privilege] => Array ( [runtime-id] => urn:ac.highwire.org:guest:privilege [type] => privilege-set [privilege-set] => GUEST ) ) [credentials] => Array ( [method] => guest ) ) ) 1naresh

Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

)

Table 2: Descriptive statistics and results of univariate regression analysis of PCs and PTH
PC Mean (SD) Regression Coefficient P Value
1 1.35 (13.62) −0.002 .897
2 37.81 (11.67) −0.006 .785
3 7.59 (11.58) −0.036 .141
4^{^a} 7.09 (10.32) 0.081 .010
5 −14.15 (9.68) 0.010 .712
6 30.59 (9.61) −0.014 .621
7 −17.36 (9.11) −0.011 .699
8 11.23 (9.02) −0.051 .105
9 13.66 (8.83) −0.033 .294
10 10.29 (8.84) −0.003 .917
11 −4.83 (8.82) 0.012 .685
12 3.99 (8.55) 0.053 .112
13 11.26 (8.30) −0.044 .196
14 −16.63 (8.15) −0.026 .419
15 −1.70 (8.03) 0.015 .645
16 −5.50 (8.02) −0.037 .274
17 −3.74 (7.92) 0.016 .627
18 −0.33 (7.65) −0.051 .152
19 −5.82 (7.61) 0.048 .180
20 −9.34 (7.74) −0.013 .691
↵a Principal component 4 was the only statistically significant predictor for posttraumatic headache.

PC	Mean (SD)	Regression Coefficient	P Value
1	1.35 (13.62)	−0.002	.897
2	37.81 (11.67)	−0.006	.785
3	7.59 (11.58)	−0.036	.141
4^{^a}	7.09 (10.32)	0.081	.010
5	−14.15 (9.68)	0.010	.712
6	30.59 (9.61)	−0.014	.621
7	−17.36 (9.11)	−0.011	.699
8	11.23 (9.02)	−0.051	.105
9	13.66 (8.83)	−0.033	.294
10	10.29 (8.84)	−0.003	.917
11	−4.83 (8.82)	0.012	.685
12	3.99 (8.55)	0.053	.112
13	11.26 (8.30)	−0.044	.196
14	−16.63 (8.15)	−0.026	.419
15	−1.70 (8.03)	0.015	.645
16	−5.50 (8.02)	−0.037	.274
17	−3.74 (7.92)	0.016	.627
18	−0.33 (7.65)	−0.051	.152
19	−5.82 (7.61)	0.048	.180
20	−9.34 (7.74)	−0.013	.691