Table 4. Multivariable relative risks of colorectal adenoma among women in the NHS II, 1991-2007, by joint categories of calcium among those with high phosphorus intake (>=1365mg/day) versus low phosphorus intake (<1365mg/day) and high magnesium intake (>=329mg/day) versus low magnesium intake (<329mg/day).

Total calcium (mg/day)	RR and (95% CI) by Category
	<=700	701-1,000	1,001-1250	1,251+
Adenoma≠
Low phosphorus
No. of Cases/ No. of Controls	323/4,904	491/7,760	215/3,698	167/3,115
Multivariable RR§	1.00	0.93(0.80-1.08)	0.83(0.69-1.01)	0.80(0.65-0.99)
High phosphorus
No. of Cases/ No. of Controls	18/324	205/3,514	306/5,512	548/10,303
Multivariable RR§	0.93(0.57-1.53)	0.91(0.76-1.10)	0.85(0.72-1.01)	0.83(0.72-0.98)
Adenoma≠
Low magnesium
No. of Cases/ No. of Controls	307/4,595	447/7,421	245/4,223	172/3,247
Multivariable RR§	1.00	0.88(0.75-1.02)	0.83(0.69-1.00)	0.80(0.65-0.98)
High magnesium
No. of Cases/ No. of Controls	34/633	249/3,853	276/4,987	543/10,171
Multivariable RR§	0.79(0.54-1.16)	0.96(0.79-1.15)	0.82(0.68-0.99)	0.81(0.68-0.97)

Adenoma found in proximal and/or distal colon and/or rectum

^†Odds ratio and 95% confidence interval from logistic regression adjusted for variables mentioned in Table 2

^‡Odds ratio and 95% confidence interval from logistic regression adjusted for variables mentioned in Table 2

^§Odds ratio and 95% confidence interval from logistic regression adjusted for variables mentioned in Table 2