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. 2013 Aug 27;35(1):581–587. doi: 10.1007/s13277-013-1081-8

Table 4.

Case-only analysis of regular users. A comparison of tumor volume according to duration, daily usage time, and cumulative hours of mobile phone use

	Tumor size (cm³)		Odds ratio (95 % CI)	p value
Duration (≤ or >10 years)	Long-term user (n = 38)	Short-term user (n = 26)	1.045 (0.987–1.107)	0.130
Duration (≤ or >10 years)	9.83 ± 11.97	5.57 ± 8.15	1.045 (0.987–1.107)	0.130
Time (≤ or >20 min/day)	Heavy user (n = 32)	Light user (n = 32)	1.073 (1.008–1.141)	0.026
Time (≤ or >20 min/day)	11.32 ± 15.43	4.88 ± 5.60	1.073 (1.008–1.141)	0.026
Cumulative hours (≤ or >2,000 h)	Heavy user (n = 26)	Light user (n = 38)	1.088 (1.023–1.157)	0.007
Cumulative hours (≤ or >2,000 h)	13.31 ± 14.07	4.88 ± 6.16	1.088 (1.023–1.157)	0.007