Table 2.
Multiple regression models predicting testosterone levels. Testosterone data were log-transformed for the regression, thus units are expressed as log(nmol/L) with 95% CI indicated. Results in bold indicate significance at α=0.05.
| Model 1 p<0.0001; R2=0.25 (n=195) |
Model 2 P<0.0001; R2=0.25 (n=195) |
Model 3(mothers only) p=0.48; R2=0.11 (n=84) |
||||
|---|---|---|---|---|---|---|
| Regression coefficient |
p- value |
Regression coefficient |
p- value |
Regression coefficient |
p- value |
|
| Married1 | −0.033 (−0.072, 0.007) |
0.10 | −0.033 (−0.073, 0.007) |
0.10 | 0.005 (−0.077, 0.088) |
0.90 |
| Mother of child age 3 or under2 | −0.065 (−0.118,−0.011) |
0.02 | −0.065 (−0.112,−0.007) |
0.03 | — | — |
| Mother of older child(ren) only2 | 0.024 (−0.023, 0.070) |
0.32 | 0.026 (−0.022, 0.074) |
0.28 | — | — |
| BMI | −0.002 (−0.003, 0.007) |
0.44 | 0.002 (−0.003, 0.007) |
0.47 | −0.0008 (−0.009, 0.007) |
0.84 |
| Age | −0.002 (−0.008, 0.005) |
0.58 | −0.002 (−0.008, 0.005) |
0.62 | −0.003 (−0.016, 0.010) |
0.65 |
| Time of serum collection | −0.023 (−0.040, −0.005) |
0.01 | −0.023 (−0.041,−0.005) |
.01 | 0.002 (−0.032, 0.035) |
0.93 |
| Testosterone assay type3 | 0.122 (0.080,0.164) |
<0.001 | 0.124 (0.082, 0.168) |
<0.001 | 0.083 (−0.006,0.171) |
0.07 |
| Average energy intake | — | — | 0.002 (−0.008, 0.012) |
0.71 | — | — |
| Physical activity level (medium)4 | — | — | −0.002 (−0.054, 0.050) |
0.94 | — | — |
| Physical activity level (high)4 | — | — | −0.013 (−0.072, 0.046) |
0.67 | — | — |
| Typical hours of sleep per night | — | — | 0.003 (−0.016, 0.022) |
0.73 | — | — |
| Age of youngest child (years) | — | — | — | — | 0.014 (0.004, 0.025) |
0.009 |
| Parity (1, 2, 3+) | — | — | — | — | 0.018 (−0.031,0.068) |
0.46 |
1
Compared to unmarried.
2
Compared to women without children.
3
Immuno1 compared to Elecsys testosterone assay type.
4
Compared to low physical activity level.