A randomized, comparative trial: does pillow type alter cervico-thoracic spinal posture when side lying?

Figures & data

Figure 1 Mean slope at zero minutes, for each spinal segment.

Table 1 Mean, standard deviation, and minimum and maximum values of slope at 0 and 10 minutes and the change in slope over 10 minutes, for each segment on each pillow

	N	Slope time 0				N	Slope time 10				Slope change
		Mean	SD	Min	Max		Mean	SD	Min	Max	Mean	SD
EOP-C2
Polyester	95	−0.097	0.176	−0.485	0.476	95	−0.101	0.201	−0.634	0.467	−0.008	0.151
Foam regular	95	−0.173	0.169	−0.594	0.304	94	−0.164	0.193	−0.640	0.514	0.011	0.098
Foam contour	95	−0.160	0.168	−0.611	0.238	93	−0.160	0.184	−0.630	0.270	0.004	0.089
Feather	92	−0.064	0.173	−0.545	0.423	91	−0.070	0.175	−0.478	0.400	−0.004	0.099
Latex	94	−0.147	0.184	−0.694	0.385	93	−0.133	0.177	−0.541	0.346	0.015	0.099
Significance of pillow effect		P < 0.0001					P= 0.002				P =0.558
C2-C4
Polyester	95	−0.037	0.223	−0.636	0.652	95	−0.047	0.198	−0.727	0.353	−0.009	0.143
Foam regular	94	−0.118	0.218	−0.800	0.500	94	−0.105	0.214	−0.700	0.500	0.012	0.129
Foam contour	94	−0.144	0.218	−0.900	0.278	94	−0.152	0.219	−0.909	0.313	−0.008	0.143
Feather	92	0.015	0.199	−0.462	0.438	91	0.010	0.213	−0.727	0.412	−0.005	0.113
Latex	93	−0.102	0.244	−1.111	0.438	93	−0.098	0.216	−1.000	0.533	0.004	0.130
Significance of pillow effect		P <0.0001					P < 0.0001				P =0.076
C4-C7
Polyester	95	0.008	0.264	−0.647	0.722	94	0.012	0.271	−0.882	0.654	0.004	0.146
Foam regular	94	−0.037	0.263	−0.765	0.563	94	−0.036	0.275	−0.677	0.706	0.001	0.162
Foam contour	94	−0.088	0.269	−0.765	0.625	93	−0.120	0.269	−0.714	0.600	−0.030	0.117
Feather	92	0.052	0.268	−0.476	0.875	91	0.046	0.282	−0.633	0.833	−0.006	0.145
Latex	93	−0.043	0.282	−1.000	0.864	93	−0.041	0.303	−1.118	0.905	0.003	0.133
Significance of pillow effect		P=0.001					P= 0.001				P= 0.91
C7-T3
Polyester	95	−0.285	0.162	−0.656	0.322	94	−0.282	0.171	−0.600	0.345	0.006	0.077
Foam regular	94	−0.299	0.151	−0.556	0.063	94	−0.305	0.289	−0.674	0.167	−0.006	0.234
Foam contour	94	−0.329	0.161	−0.760	0.155	93	−0.333	0.161	−0.741	0.288	−0.0002	0.060
Feather	92	−0.275	0.177	−0.608	0.439	91	−0.253	0.018	−0.604	0.230	0.024	0.472
Latex	93	−0.298	0.181	−0.750	0.234	93	−0.289	0.178	−0.722	0.2679	0.009	0.092
Significance of pillow effect		P = 0.23					P = 0.03				P = 0.13

Notes: The P values for pillow effect per segment for Time 0 and Time 10, and for the slope change between time periods, are reported as P values; significant P values are bold.

Abbreviations: N, number; SD, standard deviation.

Figure 2 Mean slope at 10 minutes for each spinal segment, for each pillow.

Table 2 T-test confidence limits and P values comparing spinal segment slopes for pairs of pillows at 10 minutes

	Segment	CL	P
Polyester and regular foam	EOP-C2	0.01 to 0.17	0.023
	C2-C4	−0.006 to 0.16	0.07
	C4-C7	−0.13 to 0.03	0.34
	C7-T3	−0.13 to 0.07	0.54
Regular and contour foam	EOP-C2	−0.1 to 0.04	0.48
	C2-C4	−0.04 to 0.11	0.33
	C4-C7	−0.01 to 0.2	0.07
	C7-T3	−0.03 to 0.16	0.2
Contour foam and feather	EOP-C2	−0.15 to −0.01	0.02
	C2-C4	−0.27 to −0.11	< 0.0001
	C4-C7	−0.28 to −0.07	0.002
	C7-T3	−0.16 to −0.04	0.002
Feather and latex	EOP-C2	−0.01 to 0.13	0.09
	C2-C4	0.06 to 0.24	0.001
	C4-C7	−0.03 to 0.2	0.14
	C7-T3	−0.02 to 0.12	0.14
Polyester and contour foam	EOP-C2	−0.005 to 0.13	0.07
	C2-C4	0.04 to 0.19	0.004
	C4-C7	0.05 to 0.25	0.005
	C7-T3	−0.02 to 0.09	0.26
Polyester and feather	EOP-C2	−0.1 to 0.06	0.6
	C2-C4	−0.17 to 0.01	0.09
	C4-C7	−0.14 to 0.09	0.63
	C7-T3	−0.13 to −0.005	0.03
Polyester and latex	EOP-C2	−0.3 to 0.11	0.24
	C2-C4	−0.01 to 0.16	0.08
	C4-C7	−0.05 to 0.17	0.3
	C7-T3	−0.8 to 0.05	0.6
Regular foam and feather	EOP-C2	−0.19 to −0.03	0.007
	C2-C4	−0.24 to −0.07	0.0008
	C4-C7	−0.2 to 0.03	0.16
	C7-T3	−0.14 to 0.07	0.5
Regular foam and latex	EOP-C2	−0.12 to 0.02	0.2
	C2-C4	−0.09 to 0.08	0.96
	C4-C7	−0.1 to 0.12	0.91
	C7-T3	−0.09 to 0.11	0.78
Contour foam and latex	EOP-C2	−0.9 to 0.42	0.5
	C2-C4	−0.12 to 0.04	0.31
	C4-C7	−0.19 to 0.02	0.1
	C7-T3	−0.11 to 0.01	0.13

Note: Significant findings (P < 0.01) are bold.

Abbreviation: CL, confidence limit.

Figure 3 Mean change in slope over 10 minutes for each spinal segment, for each pillow.