The association of widely used electromagnetic waves exposure and pregnancy and birth outcomes in Yazd women: a cohort study

Table 3 The association of common electromagnetic exposure sources and the preterm labor outcome

	Model No.1 (n = 1666)			Model No.2 (n = 1666)			Model No.3 (n = 1666)
Variable s	RR	CI	p	RR	CI	p	RR	CI	p
Duration of cell phone conversation ^(hour)	1.00013	0.9993–1.0009	0.72	1.0006	0.9994–1.0018	0.3	1.0004	0.9992–1.0016	0.4
Duration of cordless phone conversation ^(hour)	0.9979	0.9953–1.0004	0.1	0.9979	0.9955–1.0003	0.09	0.9982	0.9958–1.0006	0.1
Duration of exposure to Wi-Fi ^(hour)	0.9997	0.9993–1.0002	0.36	0.9998	0.9994–1.0002	0.51	0.9999	0.9994–1.0003	0.71
Number of sent SMS	0.9998682	0.9996 − 1.0001	0.33	0.9998	0.9996–1.0001	0.3	0.9998	0.9996–1.0001	0.4

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