Table 2.
Associations Between Male and Female Seafood Intake at Baseline and During Follow-Up and Frequency of Sexual Intercourse (n = 501 Couples; 2372 Follow-Up Cycles)
| Variable | Subjects or Cycles, n (%) | % Difference in SIF (95% CI) | |
|---|---|---|---|
| Model 1a | Model 2b | ||
| Male baseline seafood intake | |||
| Two times or less per month | 153 (31) | Reference | Reference |
| Three to four times per month | 118 (24) | 3.0 (−9.9 to 17.7) | 2.5 (−10.5 to 17.4) |
| Five to eight times per month | 135 (27) | 7.5 (−5.3 to 22.0) | 7.1 (−6.4 to 22.4) |
| Nine times or more per month | 95 (19) | 22.9 (6.8 to 41.5) | 21.7 (4.6 to 41.7) |
| P for trend | 0.007 | 0.02 | |
| Female baseline seafood intake | |||
| Two times or less per month | 177 (35) | Reference | Reference |
| Three to four times per month | 95 (19) | 1.1 (−11.9 to 16.0) | −2.8 (−15.5 to 11.8) |
| Five to eight times per month | 147 (29) | 1.4 (−10.0 to 14.1) | −3.8 (−15.1 to 9.1) |
| Nine times or more per month | 82 (16) | 17.3 (1.2 to 36.0) | 9.7 (−6.3 to 28.4) |
| P for trend | 0.12 | 0.60 | |
| Male daily journal seafood intake | |||
| One serving or less per cycle | 814 (34) | Reference | Reference |
| One to three servings per cycle | 422 (18) | 4.8 (−0.8 to 10.9) | 4.8 (−1.1 to 11.0) |
| Four to seven servings per cycle | 575 (24) | 16.7 (10.8 to 23.0) | 15.2 (8.8 to 22.1) |
| Eight servings or more per cycle | 561 (24) | 32.6 (25.4 to 40.2) | 26.9 (18.7 to 35.6) |
| P for trend | <0.001 | <0.001 | |
| Female daily journal seafood intake | |||
| One serving or less per cycle | 835 (35) | Reference | Reference |
| One to three servings per cycle | 446 (19) | 2.5 (−3.2 to 8.5) | −1.5 (−7.2 to 4.5) |
| Four to seven servings per cycle | 605 (26) | 9.4 (3.7 to 15.4) | 0.5 (-5.2 to 6.6) |
| Eight servings or more per cycle | 486 (20) | 26.4 (19.2 to 34.0) | 10.2 (2.9 to 18.2) |
| P for trend | <0.001 | 0.009 | |
| Couple daily journal seafood intake | |||
| At least one partner consumed fewer than 8 servings per cycle | 2057 (87) | Reference | |
| Both partners consumed eight servings or more per cycle | 315 (13) | 21.9 (15.2 to 29.0) | |
Generalized linear mixed models with Poisson distribution and log link were used to estimate the percentage of difference (95% CIs); cycles with >50% of days with missing information on SIF and cycles with <14 days of follow-up (n = 159 cycles) had their SIF values imputed (using five multiple imputations).
Model 1 adjusted for cycle length, female age, difference in male and female age, female race (non-Hispanic white vs other), male exercise (yes vs no), and male and female alcohol intake (one or more times per week vs less than one time per week).
Model 2 adjusted for variables in model 1 plus male or female partner seafood intake (using the same assessment method).