Low serum secretory immunoglobulin A level and sense of coherence score at an early gestational stage as indicators for subsequent threatened premature birth

Table 3 Logistic regression model for threatened premature birth (n = 72)

Variable	Regression	p value	OR	95%CI
Age (years)^a
≥25, ≤34/≤24	0.772	0.471	2.164	0.265–17.640
≥35/≤24	0.291	0.805	1.338	0.134–13.381
Parity^b	1.419	0.071	4.131	0.886–19.272
Smoking^c
Has a history of smoking but quit smoking/never smoked	−1.491	0.064	0.225	0.047–1.088
Current smokers/never smoked	1.015	0.417	2.759	0.238–31.960
Miscarriage or premature birth^d	−0.153	0.852	0.858	0.173–4.262
SPS^e	−1.213	0.119	0.297	0.065–1.364
SOC^f	−0.157	0.000	0.855	0.784–0.932
s-IgA^g	−1.497	0.028	0.224	0.059–0.849
Coefficient	9.276	0.001

OR odds ratio, 95%CI 95% confidence intervals
^aAge (1, ≤24; 2, ≥25, ≤34; 3, ≥35 years)
^bParity (1 = primipara, 2 = multipara)
^cSmoking, smoking habits (1 = never smoked, 2 = has a history of smoking but quit smoking, 3 = current smokers)
^dMiscarriage or premature birth, a history of miscarriage, premature birth or threatened premature birth (1 = not yet, 2 = have past history)
^eSPS (1 = low score, < 22; 2 = high score, ≥22)
^fSOC, Sense of coherence score
^gs-IgA (1 = low level, <1.18; 2 = high level, ≥1.18)

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