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. 2018 Nov 2;15(11):2444. doi: 10.3390/ijerph15112444

Table 4.

Relationship between Reproductive Status and Spontaneous Abortion in the Jinchang Cohort Study.

Variables N * Number of Spontaneous Abortions rs p
1 2 3 ≥4
n # % n % n % n %
Number of pregnancies
1 5246 39 0.74 0 0.00 0 0.00 0 0.00 0.190 0.000
2 7228 585 8.09 20 0.28 0 0.00 0 0.00
3 5731 312 5.44 202 3.52 0 0.00 0 0.00
4 3659 143 3.91 66 1.80 75 2.05 8 0.22
≥5 4049 121 2.99 84 2.07 54 1.33 76 1.88
Total 25,913 1200 4.63 372 1.44 129 0.50 84 0.32
Age at primary birth, years
<25 15,944 502 3.15 154 0.97 30 0.19 0 0.00 0.092 0.000
25~ 8922 554 6.21 158 1.77 75 0.84 37 0.41
30~ 657 76 11.57 28 4.26 18 2.74 22 3.35
≥35 249 10 4.02 2 0.80 6 2.41 0 0.00
Total 25,772 1142 4.43 342 1.33 129 0.50 59 0.23
Age at menarche, years
<12 1943 128 6.59 32 1.65 9 0.46 8 0.41 −0.016 0.032
12~ 12,260 673 5.49 200 1.63 72 0.59 58 0.47
15~ 9960 356 3.57 116 1.16 42 0.42 18 0.18
18~ 1750 43 2.46 24 1.37 6 0.34 0 0.00
Total 25,913 1200 4.63 372 1.44 129 0.50 84 0.32
Age at last pregnancy, years
<25 6333 269 4.25 42 0.66 9 0.14 0 0.00 0.061 0.000
25~ 12,540 599 4.78 196 1.56 66 0.53 19 0.15
30~ 4501 206 4.58 80 1.78 30 0.67 40 0.89
35~ 2032 92 4.53 36 1.77 24 1.18 11 0.54
40~ 372 13 3.49 8 2.15 0 0.00 0 0.00
≥45 63 3 4.76 2 3.17 0 0.00 6 9.52
Total 25,841 1182 4.57 364 1.50 129 0.50 76 0.29
Number of artificial abortions
0 13,608 791 5.81 308 2.26 111 0.82 61 0.45 −0.129 0.000
1 7811 324 4.15 46 0.59 15 0.19 19 0.24
2 3583 72 2.01 18 0.50 0 0.00 4 0.11
≥3 911 13 1.43 0 0.00 3 0.33 0 0.00
Total 25,913 1200 4.63 372 1.44 129 0.50 84 0.32

* The times of pregnancies–the times of artificial abortions; # The times of spontaneous abortions.