Table 1.

Baseline characteristics of the cases and their matched controls

Characteristic		Cases n = 103	Controls n = 103	Mean Difference (95% CI*) or P-value
Age (mean) years		57.7	57.2	0.5 (-3.6; 2.7)
Mean age at first pregnancy		25.6	26.1	-0.5 (-1.0; 1.9)
Mean age at diagnosis (SSc**)		53.0#	NA	NA
Body Mass Index during first pregnancy		22.2	22.7	-0.5 (-1.4; 0.3)
Sex of children	Male	30% (31)	19.4% (20)	0.1
	Female	16.5% (17)	22.3% (23)	0.4
	Both	47.5% (49)	57.3% (59)	0.2
Number of pregnancies	Mean	2.46	2.41	0.1 (-0.3; 0.2)
	Primipara	13.6% (14)	13.6% (14)	1.0
	Multipara	86.4% (89)	86.4% (89)	1.0
Smoking during pregnancy (% yes)		18% (18.5)	22% (23)	0.5

*CI, confidence interval; **SSc, systemic sclerosis; ^#n = 61 (59.2%), data not complete for all cases