Table 2 Spontaneous preterm birth rate within fetal fibronectin categories
fFN | n | % | PTB | Term births | PTB within 24 h | PTB in 24–48 h | PTB in 2–7 days | PTB in 7–14 days | ||
|---|---|---|---|---|---|---|---|---|---|---|
(ng/mL) | PTB at < 34 weeks (n, %) | PTB at 34–37 weeks (n, %) | (n, %) | (n, %) | (n, %) | (n, %) | (n, %) | |||
0–9 | 28 | 58 | 0 | 2(20%) | 26(69%) | 0 | 0 | 0 | 0 | |
10–49 | 9 | 19 | 0 | 2(20%) | 7(18%) | 1(2%) | 0 | 0 | 0 | |
50–99 | 5 | 11 | 2(20%) | 0 | 3(8%) | 0 | 0 | 2(4%) | 0 | |
100–199 | 2 | 4 | 0 | 0 | 2(5%) | 0 | 0 | 0 | 0 | |
200–499 | 2 | 4 | 2(20%) | 0 | 0 | 2(4%) | 0 | 0 | 0 | |
>/=500 | 2 | 4 | 2(20%) | 0 | 0 | 1(2%) | 1(2%) | 0 | 0 | |