Reproductive trends in females with inflammatory joint disease

Table 3 Newborns with birth weight < 2500 grams, SGA and preterm delivery in females with inflammatory joint diseases compared with reference births from the general population by year of birth, Norway 1967-2009

Period of birth	Group	Total n	Birth weight < 2500 gram					SGA					Preterm birth
Period of birth	Group	Total n	n	%	OR^a	95 % CI	p-value	n	%	OR^a	95 % CI	p-value	n	%	OR^a	95 % CI	p-value
1967-1979	IJD	645	37	5.7	1.4	1.0, 1.9	0.07	109	16.9	1.5	1.2, 1.9	<0.001	37	5.7	1.1	0.8, 1.5	0.53
1967-1979	Ref	773563	32962	4.3	1.4	1.0, 1.9	0.07	91 495	11.8	1.5	1.2, 1.9	<0.001	40 475	5.2	1.1	0.8, 1.5	0.53
1980-1989	IJD	1613	91	5.6	1.4	1.2, 1.8	0.001	201	12.4	1.2	1.04, 1.40	0.01	117	7.2	1.5	1.2, 1.8	<0.001
1980-1989	Ref	517621	20250	3.9	1.4	1.2, 1.8	0.001	54 770	10.6	1.2	1.04, 1.40	0.01	25 354	4.9	1.5	1.2, 1.8	<0.001
1990-1999	IJD	2508	119	4.7	1.2	1.03, 1.5	0.03	267	10.6	1.2	1.1, 1.4	0.001	180	7.2	1.4	1.2, 1.6	<0.001
1990-1999	Ref	581627	22541	3.9	1.2	1.03, 1.5	0.03	51 705	8.9	1.2	1.1, 1.4	0.001	30 635	5.3	1.4	1.2, 1.6	<0.001
2000-2009	IJD	2736	117	4.3	1.2	0.9, 1.4	0.12	210	7.7	1.1	0.9, 1.2	0.31	195	7.1	1.3	1.1, 1.5	0.001
2000-2009	Ref	564299	20907	3.7	1.2	0.9, 1.4	0.12	41 094	7.3	1.1	0.9, 1.2	0.31	31 552	5.6	1.3	1.1, 1.5	0.001

IJD inflammatory joint diseases, Ref references, SGA small for gestational age, OR odds ratio, CI confidence interval
^aAdjusted for maternal age at delivery and parity

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