Table 1.

Demographic and reproductive characteristics of 211 women [297 in vitro fertilization (IVF) cycles] in the Environment and Reproductive Health (EARTH) study.

Characteristics	Total cohort median (IQR) or $n$ (%)
Demographic characteristics
Age, years	35.0 (32.0, 37.0)
Race/ethnic group, $n$ (%)
Black/Asian/other	28 (13)
White/Caucasian	183 (87)
Body mass index, ${\mathrm{kg}/\mathrm{m}}^2$	22.8 (20.8, 25.8)
Ever smoker, $n$ (%)	52 (25)
Education, $n$ (%)a
High school/some college	12 (6)
College graduate	71 (37)
Graduate degree	109 (57)
Reproductive/cycle characteristics
History of ever been pregnant	71 (34)
Day 3 FSH levels, IU/L	6.7 (5.9, 8.1)
Initial infertility diagnosis, $n$ (%)
Female factor	75 (36)
Male factor	62 (29)
Unexplained	74 (35)
Previous intrauterine insemination, $n$ (%)a	85 (41)
Previous in vitro fertilization, $n$ (%)a	43 (21)
Treatment protocol, $n$ (%)
Antagonist	37 (13)
Flareb	54 (18)
Luteal phase agonistc	206 (69)
E2 trigger levels, $\text{pmol}/\text{L}$	1,965 (1,517, 2,570)
ICSI cycles, $n$ (%)	167 (56)
Cycle canceled prior to transfer, $n$ (%)	16 (5)
Embryo transfer day, $n$ (%)
Number of embryos transferred	16 (5)
Day 2	16 (5)
Day 3	163 (55)
Day 5	102 (35)
Number of embryos transferred, $n$ (%)
0 embryos	16 (5)
1 embryo	56 (19)
2 embryos	162 (55)
$\ge 3$ embryos	63 (21)

Note: ${\text{E}}_2$, estradiol; FSH, follicle stimulating hormone; ICSI, intracytoplasmatic sperm injection; IQR, interquartile range.

^aHas missing data (19 missing education; 3 missing previous IUI and IVF).

^bFollicular phase GnRH agonist/flare protocol.

^cLuteal phase GnRH agonist protocol.