Table 4. Multivariate Analysis of Pregnancy and Labor/Delivery Complications in Relation to Lymphoma Risk Among California Children Age 0-5 Diagnosed Between 1988 and 2007.

	Controls	Lymphoma cases, total
	N/ N total*	N/ N total*	OR† (95% CI)
Years collected 2006+
Epidural	2980/7780	6/14	0.85 (0.27, 2.68)
1989-2005
Premature labor	4169/174962	10/384	1.15 (0.62, 2.17)
Amniocentisis	4158/174962	6/384	0.68 (0.30, 1.53)
Tocolysis	1536/174962	7/384	2.24 (1.06, 4.75)
Febrile (> 100 F)	2052/174962	6/384	1.40 (0.62, 3.14)
1989+
Previous pre-term birth	2013/182742	9/398	2.22 (1.14, 4.32)
Pre-eclampsia	3897/182742	6/398	0.73 (0.33, 1.63)
Prolonged labor (> 20 hours)	1380/182742	5/398	1.73 (0.71, 4.18)
Premature rupture of membrane	3505/182742	10/398	1.38 (0.73, 2.58)
Induction of labor	16921/182742	29/398	0.80 (0.56, 1.18)
Stimulation of labor	18144/182742	38/398	0.97 (0.69, 1.36)
Moderate/heavy meconium staining of amniotic fluid	7629/182742	22/398	1.39 (0.90, 2.13)
All study years
Small for gestational age	20564/196525	46/454	1.04 (0.75, 1.45)
Large for gestational age	20653/196525	59/454	1.17 (0.85, 1.62)
Preterm birth	20118/196960	45/455	0.88 (0.62, 1.26)
1986-2005
Fetopelvic disproportion	4803/200235	17/464	1.93 (1.15, 3.24)
Breech or other abnormal presentation	5944/200235	12/464	0.73 (0.36, 1.47)
Fetal distress	6308/200235	12/464	0.86 (0.46, 1.62)
All study years
Low birth weight	12119/207549	26/477	0.87 (0.55, 1.37) 1.37)
High birth weight	22114/207549	67/477	1.24 (0.92, 1.68)
Previous still birth	3008/207687	9/478	1.31 (0.62, 2.78)

^*The total sample sizes reflected in each row may be smaller than the total number of subjects due to collection of some variables during only a subset of study years

^†ORs are adjusted for birth year, maternal age and race, and prenatal payment source