Table IV.
Association of an interquartile increase in constituents of particulate matter and fecundability, multipollutant model, adjusteda; the LIFE Study (2005–2009).
| AEC | ANH4 | ANO3 | AOC | ASO4 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| FOR | 95% CI | FOR | 95% CI | FOR | 95% CI | FOR | 95% CI | FOR | 95% CI | |
| Time-varying cycle averages (n = 500)b | ||||||||||
| Prior cycle | 0.91 | 0.74, 1.13 | 1.07 | 0.89, 1.29 | 1.04 | 0.92, 1.17 | 0.99 | 0.86, 1.15 | 1.01 | 0.82, 1.24 |
| Proliferative phase | 1.00 | 0.83, 1.20 | 1.03 | 0.90, 1.18 | 1.00 | 0.89, 1.11 | 1.00 | 0.87, 1.14 | 1.07 | 0.92, 1.26 |
| Days from ovulation (n = 440)c | ||||||||||
| −5 | 1.02 | 0.88, 1.20 | 1.06 | 0.96, 1.17 | 1.05 | 0.97, 1.14 | 1.02 | 0.91, 1.14 | 1.05 | 0.94, 1.18 |
| −4 | 0.99 | 0.84, 1.17 | 1.06 | 0.96, 1.16 | 1.01 | 0.93, 1.10 | 0.98 | 0.88, 1.10 | 1.09 | 0.98, 1.23 |
| −3 | 0.93 | 0.78, 1.10 | 1.10 | 1.00, 1.21 | 1.02 | 0.94, 1.11 | 0.99 | 0.88, 1.11 | 1.12 | 1.01, 1.25 |
| −2 | 0.92 | 0.78, 1.08 | 1.10 | 1.00, 1.22 | 1.05 | 0.97, 1.14 | 0.96 | 0.86, 1.08 | 1.11 | 0.99, 1.23 |
| −1 | 0.96 | 0.81, 1.14 | 1.02 | 0.92, 1.12 | 1.04 | 0.96, 1.13 | 1.04 | 0.92, 1.16 | 1.01 | 0.90, 1.13 |
| 0 | 1.00 | 0.85, 1.19 | 0.95 | 0.85, 1.05 | 1.01 | 0.92, 1.10 | 1.08 | 0.97, 1.22 | 0.93 | 0.83, 1.05 |
| 1 | 0.94 | 0.79, 1.13 | 1.00 | 0.90, 1.12 | 1.06 | 0.98, 1.15 | 1.07 | 0.95, 1.20 | 0.96 | 0.86, 1.09 |
| 2 | 0.94 | 0.79, 1.12 | 1.02 | 0.92, 1.13 | 1.07 | 0.99, 1.15 | 1.00 | 0.89, 1.12 | 0.98 | 0.88, 1.10 |
| 3 | 0.95 | 0.80, 1.13 | 1.06 | 0.96, 1.18 | 1.04 | 0.96, 1.13 | 0.99 | 0.88, 1.11 | 1.05 | 0.94, 1.18 |
| 4 | 1.06 | 0.90, 1.25 | 1.00 | 0.90, 1.11 | 1.02 | 0.93, 1.11 | 1.04 | 0.92, 1.17 | 0.98 | 0.87, 1.10 |
| 5 | 1.04 | 0.90, 1.25 | 1.05 | 0.95, 1.16 | 1.06 | 0.97, 1.15 | 1.01 | 0.90, 1.14 | 1.02 | 0.90, 1.15 |
| 6 | 1.04 | 0.89, 1.21 | 1.08 | 0.98, 1.19 | 1.06 | 0.97, 1.15 | 1.00 | 0.89, 1.13 | 1.06 | 0.94, 1.19 |
| 7 | 0.93 | 0.78, 1.10 | 1.07 | 0.97, 1.19 | 0.98 | 0.90, 1.07 | 0.98 | 0.87, 1.10 | 1.12 | 0.99, 1.26 |
| 8 | 0.94 | 0.78, 1.12 | 1.01 | 0.91, 1.12 | 0.92 | 0.84, 1.02 | 1.02 | 0.91, 1.15 | 1.07 | 0.95, 1.20 |
| 9 | 0.96 | 0.81, 1.15 | 1.02 | 0.92, 1.13 | 0.97 | 0.88, 1.06 | 1.01 | 0.90, 1.14 | 1.05 | 0.93, 1.18 |
| 10 | 0.96 | 0.80, 1.14 | 1.00 | 0.90, 1.11 | 0.98 | 0.89, 1.07 | 0.98 | 0.87, 1.11 | 1.04 | 0.92, 1.17 |
AEC, elemental carbon; ANH4, ammonium; ANO3, nitrate; AOC, organic compounds; ASO4, sulfate. Bold text indicates p < 0.05.
aAdjusted for total fine particulates <2.5 microns, site (Michigan vs. Texas), maternal age (years), race/ethnicity (non-Latino white, non-Latino black, Latino or other race/ethnicity), body mass index (kg/m2), parity conditional on gravidity (nulligravous, gravous/nulliparous and parous), education (high school or less, some college and college graduate or greater), household income (<$40 000, $40– < $70 000, $70 000– < $100 000 and ≥$100 000) and smoking status (serum cotinine ≥40.35 vs. <40.35 ng/mL).
bMean air pollution level during the cycle prior to the observed cycle (prior cycle) and the first 10 days of the observed cycle (prolierative phase).
cMean daily air pollution level from 5 days before to 10 days following ovulation in the observed cycle. Excludes 60 participants who achieved pregnancy or were censored at the end of the entry cycle (ovulation date not assessed).