Table 6 Range-standardized temperature-controlled model inferential statistics for ovulation rate and sexual behavior measurements.

From: A multi-site study of the relationship between photoperiod and ovulation rate using Natural Cycles data

 

3-over-6 Ovulation

Coverline Ovulation

LH Test

Ovulation

Natural Cycles Ovulation

Logged Libido

Logged Sex

Covariate

b (SE)

b (SE)

b (SE)

b (SE)

b (SE)

b (SE)

Sweden

(n = 56,936)

      

Intercept

0.0001 (0.147)

0.001 (0.106)

−0.0005 (0.197)

0.002 (0.378)

0.669 (0.096)***

0.180 (0.014)***

Age

0.009 (0.003)***

0.016 (0.002)***

0.008 (0.004)*

0.048 (0.008)***

−0.006 (0.002)**

−0.001 (0.0003)***

BMI Proxy

−0.011 (0.003)***

0.004 (0.004

−0.010 (0.004)**

0.025 (0.010)**

0.003 (0.002)

0.0003 (0.0003)

Cycle Length

0.047 (0.003)***

0.007 (0.007)**

0.005 (0.004)

0.064 (0.005)***

−0.005 (0.002)**

−0.001 (0.0002)***

Day Length

0.007 (0.002)***

0.001 (0.001)

−0.0001 (0.002)

0.001 (0.003)

−0.001 (0.001)

−0.0001 (0.0001)

Temperature

−0.002 (0.001)*

−0.0003 (0.001)

−0.005 (0.001)***

−0.001 (0.002)

0.001 (0.001)

0.0003 (0.0001)***

United States

(n = 326,137)

      

Intercept

0.001 (0.065)

0.001 (0.048)

−0.0004 (0.087)

0.003 (0.156)

0.640 (0.040)***

0.242 (0.006)***

Age

0.003 (0.001)**

0.012 (0.001)***

0.007 (0.001)***

0.038 (0.003)***

−0.005 (0.001)***

−0.002 (0.0001)***

BMI Proxy

−0.012 (0.001)***

−0.001 (0.001)

−0.006 (0.001)***

0.012 (0.003)***

0.003 (0.001)***

−0.0001 (0.0001)

Cycle Length

0.054 (0.001)***

0.007 (0.001)***

0.008 (0.002)***

0.068 (0.003)***

−0.006 (0.001)***

−0.001 (0.0001)***

Day Length

0.003 (0.002)*

0.006 (0.001)***

−0.006 (0.002)**

0.018 (0.003)***

0.004 (0.001)***

0.0004 (0.0001)***

Temperature

−0.0002 (0.0004)

0.0003 (0.003)

−0.0004 (0.005)

0.0001 (0.001)

−0.001 (0.0002)*

0.000004 (0.00003)

  1. Day Length = number of minutes of ambient day light; BMI = body mass index; *** p ≤ .001; ** p ≤ .01; *p ≤ .05.