Table 2.
Statistics of sexual debut in China, stratified by age group and geographic region.
| Age group (years) | Urban | Rural | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| Total number | Without sexual activitya (number, %) | Sexual debut age | Total number | Without sexual activitya (number, %) | Sexual debut age | |||||||
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| Standard analysisb | Cohort analysise | Standard analysisb | Cohort analysise | |||||||||
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| Medianc | Mean±SD | Medianf | Mean | Mediand | Mean±SD | Mediang | Mean | |||||
| 15–19 | 594 | 530 (89.2) | 17 | 16.4±1.3 | – | 18.7 | 940 | 898 (95.5) | 17 | 16.9 ±0.9 | – | 18.8 |
| 20–24 | 612 | 340 (55.6) | 19 | 19.4±1.8 | 23 | 21.8 | 810 | 306 (37.8) | 19 | 19.3 ±1.7 | 21 | 20.8 |
| 25–29 | 705 | 110 (15.6) | 22 | 21.6±2.5 | 22 | 22.7 | 945 | 57 (6.0) | 21 | 20.6 ±2.4 | 21 | 21.1 |
| 30–34 | 682 | 16 (2.3) | 22 | 22.0 ±2.9 | 22 | 22.3 | 1061 | 7 (0.7) | 20 | 20.6 ±2.6 | 20 | 20.6 |
| 35–39 | 649 | 4 (0.6) | 22 | 22.0 ±2.9 | 22 | 22.1 | 889 | 0 (0.0) | 21 | 20.8 ±2.9 | 21 | 20.8 |
| 40–44 | 464 | 2 (0.4) | 22 | 21.7±2.8 | 22 | 21.8 | 687 | 1 (0.1) | 20 | 20.5 ±2.7 | 20 | 20.5 |
| 45–49 | 452 | 5 (1.1) | 22 | 22.0 ±2.6 | 22 | 22.3 | 681 | 5 (0.7) | 21 | 20.7 ±2.6 | 21 | 20.9 |
| 50–54 | 356 | 4 (1.1) | 23 | 22.4 ±2.8 | 23 | 22.7 | 531 | 3 (0.6) | 21 | 21.0±2.8 | 21 | 21.2 |
| 55–59 | 247 | 0 (0.0) | 23 | 22.4 ±3.2 | 23 | 22.4 | 376 | 7 (1.9) | 20 | 20.3 ±3.1 | 20 | 21.0 |
| Total | 4761 | 1011 (21.1) | 22 | 21.7±2.9 | 22 | 22.5 | 6920 | 1284 (18.6) | 20 | 20.5 ±2.7 | 21 | 21.1 |
SD, standard deviation.
a
rs = 0.63, P < 0.0001.
b
Participants with at least one sexual experience.
c
rs = 0.21, P < 0.0001.
d
rs= 0.10, P < 0.001.
e
All participants in age group.
f
Log Rank Test, χ2 =59.94, P < 0.0001.
g
Log Rank Test, χ2 =103.94, P < 0.0001.