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Table 7 Examination of the relationship between seminal plasma cadmium levels and categorical variables.a

From: Cadmium Concentrations in Blood and Seminal Plasma: Correlations with Sperm Number and Motility in Three Male Populations (Infertility Patients, Artificial Insemination Donors, and Unselected Volunteers)

Population Variable Group n Median Interquartile range P
Group 1: infertility patients       
  Alcohol consumption      
   No
Yes
88
29
0.285
0.287
\(\left. {\matrix{ {0.243-0.356} \cr {0.244-0.343} \cr } } \right\}\) 0.767, NS
  Prescription medications      
   No
Yes
51
70
0.286
0.281
\(\left. {\matrix{ {0.229-0.364} \cr {0.247-0.346} \cr } } \right\}\) 0.933, NS
  Vitamins and/or minerals      
   No
Yes
98
25
0.282
0.291
\(\left. {\matrix{ {0.242-0.350} \cr {0.254-0.343} \cr } } \right\}\) 0.875, NS
  Smoking      
   No
Yes
107
16
0.285
0.279
\(\left. {\matrix{ {0.243-0.347} \cr {0.257-0.356} \cr } } \right\}\) 0.899, NS
  Caffeine consumption      
   No
Yes
22
101
0.279
0.293
\(\left. {\matrix{ {0.229-0.332} \cr {0.244-0.350} \cr } } \right\}\) 0.440, NS
Group 2: AI donors       
  Alcohol consumption      
   No
Yes
3
4
0.099
0.106
\(\left. {\matrix{ {0.087-0.102} \cr {0.092-0.116} \cr } } \right\}\) 0.400, NS
Group 3: General population volunteers       
  Alcohol consumption      
   No
Yes
17
16
0.093
0.085
\(\left. {\matrix{ {0.076-0.110} \cr {0.081-0.102} \cr } } \right\}\) 0.601, NS
  Prescription medications      
   No
Yes
26
8
0.092
0.082
\(\left. {\matrix{ {0.081-0.116} \cr {0.075-0.094} \cr } } \right\}\) 0.310, NS
  Smoking      
   No
Yes
21
10
0.086
0.092
\(\left. {\matrix{ {0.073-0.105} \cr {0.082-0.118} \cr } } \right\}\) 0.473, NS
  1. aResults for seminal plasma and blood plasma cadmium levels are presented in micrograms per liter. P = Mann-Whitney test P value; NS, not significant.