Table 3.
Factors for unintended pregnancy among graduate students active in premarital sex
| Factors |
Male students (n=1831) |
Female students (n=1059) |
||||
|---|---|---|---|---|---|---|
| Total n (%) | IOPa n (%) | CORb(95% CI) | Total n (%) | IOPa n (%) | CORb(95% CI) | |
| Educational levels | ||||||
| Master candidate |
1467(80.1) |
296(20.2) |
1 |
885(83.6) |
148(16.7) |
1 |
| Doctoral candidate |
364(19.9) |
77(21.2) |
1.06(0.80,1.41) |
174(16.4) |
40(23.0) |
1.49(1.01,2.22) |
| Discipline | ||||||
| nonmedical |
1434(78.3) |
299(20.9) |
1 |
818(77.2) |
137(16.7) |
1 |
| medical |
397(21.7) |
74(18.6) |
0.87(0.66,1.15) |
241(22.8) |
51(21.2) |
1.33(0.93,1.91) |
| Whether having a steady lover | ||||||
| Yes |
1616(88.3) |
302(18.7) |
1 |
979(92.4) |
156(15.9) |
1 |
| No |
215(11.7) |
71(33.0) |
2.13(1.56,2.94) |
80(7.6) |
32(40.0) |
3.57(2.17,5.56) |
| Disposable income per month | ||||||
| <400(yuan) |
360(19.7) |
79(21.9) |
1.13(0.86,1.58) |
184(17.4) |
47(25.5) |
1.90(1.26,2.87) |
| 400~899 (yuan) |
792(43.3) |
154(19.4) |
1 |
503(47.5) |
77(15.3) |
1 |
| ≥900(yuan) |
679(37.1) |
140(20.6) |
1.08(0.83,1.39) |
372(35.1) |
64(17.2) |
1.15(0.80,1.65) |
| Age at first sexual intercourse | ||||||
| <20 years |
346(18.9) |
91(26.3) |
1.53(1.16,2.00) |
118(11.1) |
39(33.1) |
2.62(1.72,4.00) |
| ≥20 years |
1485(81.1) |
282(19.0) |
1 |
941(88.9) |
149(15.8) |
1 |
| Whether knowing the conditions of conception | ||||||
| Yesc |
1384(75.6) |
243(17.6) |
1 |
851(80.4) |
134(15.7) |
1 |
| No |
447(24.4) |
130(29.1) |
1.93(1.50,2.46) |
208(19.6) |
54(26.0) |
1.88(1.31,2.69) |
| Whether knowing the use of the menstrual cycle for contraception | ||||||
| Yesd |
1087(59.4) |
199(18.3) |
1 |
801(75.6) |
130(16.2) |
1 |
| No |
744(40.6) |
174(23.4) |
1.36(1.08,1.71) |
258(24.4) |
58(22.5) |
1.50(1.06,2.12) |
| Whether thinking abortion endanger women's physical and mental health | ||||||
| Yes |
1452(79.3) |
280(19.3) |
1 |
905(85.5) |
148(16.4) |
1 |
| No |
379(20.7) |
93(24.5) |
1.36(1.04,1.78) |
154(14.5) |
40(26.0) |
1.80(1.20,2.68) |
| Whether thinking abortion endanger women’s future pregnancy | ||||||
| Yes |
1645(89.8) |
293(17.8) |
1 |
1007(95.1) |
166(16.5) |
1 |
| No |
186(10.2) |
80(43.0) |
3.48(2.54,4.78) |
52(4.9) |
22(42.3) |
3.72(2.09,6.62) |
| Whether use of condoms at first sexual intercourse | ||||||
| Yes |
675(36.9) |
119(17.6) |
1 |
322(30.4) |
27(8.4) |
1 |
| No |
1156(63.1) |
254(22.0) |
1.24(1.02,1.51) |
737(69.6) |
161(21.8) |
3.03(2.00,4.76) |
| Whether use of contraceptives at first sexual intercourse | ||||||
| Yes |
1718(93.8) |
341(19.8) |
1 |
964(91.0) |
168(17.4) |
1 |
| No |
113(6.2) |
32(28.3) |
1.60(0.94,2.44) |
95(9.0) |
20(21.1) |
1.26(0.75,2.13) |
| Frequency of use of contraception(methods were looked as effective for preventing pregnancy by responders) | ||||||
| Always use |
548(29.9) |
105(19.2) |
1.71(0.83,3.55) |
358(33.8) |
48(13.4) |
0.40(0.16,0.91) |
| Often/sometimes |
1209(66.0) |
259(21.4) |
1.97(0.97,4.01) |
676(63.8) |
133(19.7) |
0.63(0.26,1.53) |
| Never use | 74(4.1) | 9(12.2) | 1 | 25(2.4) | 7(28.0) | 1 |
a: incidence of pregnancy; b: crude odds ratio; c: students select all correct answers of conditions of conception but no wrong answers from list [detail of information was showed as below: What are the basic conditions for human conception? (Multiple choice) 1, healthy and active sperm can get into the vagina, and remain active force; 2, healthy and mature egg; 3, cervical mucus must be appropriate and conducive to sperm survival and penetration; 4, unobstructed reproductive tract to make the sperm and egg meeting; 5, sperm and egg must combined and formed a fertilized egg; 6, fertilized egg reach the uterine cavity timely, and the intrauterine environment is suitable for the growth and development of fertilized egg. 7, the sex intercourse between male and female. If a student chose answer 1,2,3,4,5 and 6 but no 7,.we considered it as ‘knowing the conditions of conception’, otherwise ‘no’]; d: students select right answers of calculating periodic abstinence and select the answer of periodic abstinence being not completely safe for contraception from list.