Table 4.

Number of births and crude mean ± SD for birth weight and gestational duration by PCE exposure category.

	No.	Mean ± SD
Birth weight (g)
Cumulative PCE exposure before LMP month and year
≥ 75th	301	3,482 ± 516
50th– < 75th	300	3,511 ± 557
25th– < 50th	300	3,455 ± 486
> 0– < 25th	300	3,509 ± 500
0 (referent)	924	3,474 ± 490
Peak annual PCE exposure before LMP year
≥ 75th	239	3,473 ± 523
50th– < 75th	239	3,533 ± 551
25th– < 50th	239	3,453 ± 479
> 0– < 25th	238	3,527 ± 503
0 (referent)	1,170	3,472 ± 495
Average monthly PCE exposure during LMP year
≥ 75th	277	3,485 ± 495
50th– < 75th	276	3,483 ± 521
25th– < 50th	279	3,487 ± 570
> 0– < 25th	274	3,481 ± 481
0 (referent)	1,019	3,481 ± 490
Gestational duration (weeks)
Cumulative PCE exposure before LMP month and year
≥ 75th	301	40.1 ± 2.1
50th– < 75th	300	40.1 ± 2.5
25th– < 50th	300	40.2 ± 2.1
> 0– < 25th	300	40.2 ± 2.2
0 (referent)	924	40.2 ± 2.0
Peak annual PCE exposure before LMP year
≥ 75th	239	40.1 ± 2.2
50th– < 75th	239	40.1 ± 2.5
25th– < 50th	239	40.2 ± 2.0
> 0– < 25th	238	40.0 ± 2.1
0 (referent)	1,170	40.2 ± 2.0
Average monthly PCE exposure during LMP year
≥ 75th	277	40.1 ± 1.9
50th– < 75th	276	40.1 ± 2.4
25th– < 50th	279	40.3 ± 2.4
> 0– < 25th	274	40.0 ± 2.2
0 (referent)	1,019	40.2 ± 1.9

25th, 50th, and 75th are percentiles.