Table 3

OR with 95% CI for no and one lifetime pregnancy (reference: women with ≥2 pregnancies) by prepregnant lipid quintiles in 4322 women in the Cohort of Norway (1994–2003), analyses stratified by BMI

Lipid quintiles* in mmol/L	Women with prepregnant BMI<25							Women with prepregnant BMI≥25
	n	n^a	n^b	N	Nulliparous	One-child mothers OR (95% CI)	P for trend	n	n^a	n^b	N	Nulliparous OR (95% CI)	One-child mothers OR (95% CI)	P for trend
	n	n^a	n^b	N	OR (95% CI)	One-child mothers OR (95% CI)	P for trend	n	n^a	n^b	N	Nulliparous OR (95% CI)	One-child mothers OR (95% CI)	P for trend
LDL cholesterol†							0.84							0.44
<2.42	377	219	69	665	1.0 (reference)	1.0 (reference)		72	41	11	124	1.0 (reference)	1.0 (reference)
2.43–2.84	343	240	64	647	1.1 (0.9 to 1.5)	0.9 (0.6 to 1.4)		90	68	20	178	1.1 (0.6 to 2.1)	1.4 (0.6 to 3.3)
2.85–3.24	341	216	67	624	1.0 (0.7 to 1.3)	0.9 (0.6 to 1.3)		113	109	23	245	1.5 (0.8 to 2.6)	1.4 (0.6 to 3.3)
3.25–3.76	315	198	69	582	1.0 (0.8 to 1.4)	1.1 (0.7 to 1.6)		111	152	39	302	1.7 (1.0 to 3.0)	1.8 (0.8 to 4.0)
>3.77	230	187	64	481	1.2 (0.9 to 1.6)	1.2 (0.8 to 1.8)		158	233	57	448	1.7 (1.0 to 3.0)	1.8 (0.8 to 3.8)
Total cholesterol							0.13							0.04
<4.19	359	198	75	632	1.0 (reference)	1.0 (reference)		73	60	19	152	1.0 (reference)	1.0 (reference)
4.20–4.61	341	231	57	629	1.4 (1.1 to 1.9)	0.8 (0.5 to 1.2)		115	73	17	205	0.6 (0.3 to 1.0)	0.7 (0.3 to 1.5)
4.62–5.0	332	191	64	587	1.0 (0.7 to 1.3)	0.8 (0.5 to 1.2)		102	114	27	243	1.3 (0.8 to 2.2)	1.2 (0.6 to 2.5)
5.1–5.63	327	244	72	643	1.3 (0.9 to 1.7)	0.9 (0.6 to 1.4)		114	167	37	318	1.5 (0.9 to 2.5)	1.2 (0.6 to 2.4)
>5.64	248	196	66	510	1.3 (0.9 to 1.7)	1.0 (0.7 to 1.5)		143	197	53	393	1.2 (0.7 to 2.0)	1.2 (0.6 to 2.4)
TG							0.04							<0.001
<0.66	363	311	69	743	1.0 (reference)	1.0 (reference)		66	59	12	137	1.0 (reference)	1.0 (reference)
0.67–0.86	364	248	82	694	0.8 (0.6 to 1.0)	1.2 (0.5 to 2.8)		83	102	18	203	1.7 (1.0 to 3.0)	1.2 (0.5 to 2.8)
0.87–1.09	339	208	65	612	0.9 (0.7 to 1.2)	1.3 (0.7 to 3.8)		115	85	23	223	1.6 (0.9 to 2.8)	1.7 (0.7 to 3.8)
1.10–1.45	319	156	58	533	0.8 (0.6 to 1.1)	1.3 (0.9 to 4.8)		133	146	30	309	2.5 (1.5 to 4.4)	2.1 (0.9 to 4.8)
>1.46	222	137	59	418	1.0 (0.7 to 1.4)	2.0 (1.7 to 7.4)		149	219	70	438	2.8 (1.7 to 4.7)	3.5 (1.6 to 7.4)
HDL cholesterol							0.05							0.17
<1.20	198	70	47	315	0.9 (0.7 to 1.2)	1.7 (1.1 to 2.6)		127	191	50	368	1.9 (1.2 to 3.0)	2.6 (1.3 to 5.3)
1.21–1.40	189	138	43	370	0.9 (0.7 to 1.1)	1.0 (0.6 to 1.5)		81	122	31	234	1.7 (1.0 to 2.8)	2.3 (1.1 to 4.9)
1.41–1.60	475	287	93	855	0.8 (0.6 to 1.1)	1.1 (0.8 to 1.5)		158	143	37	338	1.4 (0.9 to 2.2)	1.8 (0.9 to 3.6)
1.61–1.84	358	272	74	704	0.7 (0.5 to 1.0)	1.0 (0.7 to 1.4)		85	82	18	185	1.4 (0.8 to 2.4)	1.8 (0.8 to 4.0)
>1.85	387	293	77	757	1.0 (reference)	1.0 (reference)		96	73	17	186	1.0 (reference)	1.0 (reference)
TG:HDL-c ratio							0.04							<0.001
<0.39	374	321	70	765	1.0 (reference)	1.0 (reference)		67	42	10	119	1.0 (reference)	1.0 (reference)
0.40–0.54	365	245	75	685	0.8 (0.6 to 1.0)	1.2 (0.8 to 1.7)		85	99	17	201	2.2 (1.2 to 4.0)	1.9 (0.7 to 4.9)
0.55–0.73	365	213	71	649	0.8 (0.6 to 1.1)	1.2 (0.8 to 1.8)		101	91	22	214	2.4 (1.3 to 4.3)	2.2 (0.9 to 5.5)
0.74–1.04	281	172	64	517	0.9 (0.7 to 1.2)	1.6 (1.1 to 2.4)		138	131	33	302	3.3 (1.9 to 5.9)	3.1 (1.3 to 7.4)
>1.05	222	109	53	384	0.8 (0.6 to 1.0)	1.8 (1.2 to 2.8)		155	248	71	474	3.6 (2.1 to 6.1)	4.3 (1.9 to 10.0)

The estimates were obtained by multinomial logistic regression, stratified by BMI and adjusted for age at examination, educational level, smoking, time since last meal and oral contraceptive use.
Number of women: with ≥2 children (n, reference group), nulliparous women (n^a), one-child mothers (n^b) and total number of women within the category (N).
*Quintiles calculated on a total sample prior to pregnancy.
†Missing data within lipids on 16 cases of LDL, 2 cases of TG and 2 cases of TG:HDL-c ratio.
BMI, body mass index; LDL, low-density lipoprotein; TG, triglyceride; TG:HDL, TG to high-density lipoprotein ratio.