Condom use in last sexual intercourse among undergraduate students: how many are using them and who are they?

Moreira, Laísa Rodrigues; Dumith, Samuel Carvalho; Paludo, Simone dos Santos

doi:10.1590/1413-81232018234.16492016

Brasil

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Free Themes • Ciênc. saúde colet. 23 (4) • Apr 2018 • https://doi.org/10.1590/1413-81232018234.16492016 linkcopy

Condom use in last sexual intercourse among undergraduate students: how many are using them and who are they?

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Abstract

A cross-sectional study was conducted to measure the prevalence of condom use in the last sexual intercourse and associated factors among university students. Undergraduate students from a public university aged 18 and over of the Rio Grande (RS) campuses were eligible. A systematic single-stage sampling was used, based on class lists and self-administered questionnaire. Descriptive, bivariate and multivariable analyses were employed, with Poisson regression for the latter two. Most of the 1,215 university students included in the analysis were aged 20 to 29 (65.6%) and 69.3% began their sexual life before the age of 18. The prevalence of condom use in the last intercourse was 41.5% (95%CI: 38.7-44.3). Male gender, lower age group, condom use at first sexual intercourse, older age of onset of sexual activity, not having a partner and casual partner in the last sexual intercourse increased the likelihood of condom use.

Key words Condoms; Universities; Sexual health; Adult

Variable		N^* * The total number of the sample is 1,215. However, depending on the ignored values for each exposure variable, the total sum of the categories can result in a value smaller than the sample size.	%^† † Percentage calculated based on the number of respondents.
Gender (N = 1197)
	Female	601	50.2
	Male	596	49.8
Age group (years) (N = 1121)
	18-19	149	13.3
	20-24	543	48.4
	25-29	193	17.2
	≥ 30	236	21.1
Household income (N = 1132)
	1st quartile	266	23.5
	2nd quartile	308	27.2
	3rd quartile	263	23.2
	4th quartile	295	26.1
Current marital status (N = 1207)
	Without a partner	434	36.0
	Dating	449	37.2
	Married or with a partner / Living together	324	26.8
Living with… (N = 1207)
	Alone	149	12.3
	Family	812	67.3
	Friends, boarding school or student house	246	20.4
Age at first sexual intercourse (years) (N = 1212)
	≤ 14	181	14.9
	15 to 17	659	54.4
	≥ 18	372	30.7
Condom in first sexual intercourse (N = 1211)
	No	320	26.4
	Yes	891	73.6
Number of sexual partners in the last month (N = 1204)
	None	172	14.3
	One	942	78.2
	Two or more	90	7.5
Type of partner in the last sexual intercourse (N = 1211)
	Steady partner	920	76.0
	Casual partner	291	24.0
Condom use in the last sexual intercourse (N = 1215)
	No	711	58.5
	Yes	504	41.5

Variable		P	Crude Analysis		Adjusted Analysis
Variable		P	PR	CI95%	P-value	PR	CI95%	P-value
Gender					< 0.001			< 0.001
	Female	34.9	1.00			1.00
	Male	47.9	1.37	1.20-1.58		1.42	1.23-1.65
Age (years)					< 0.001^* * P-value of Wald test for linear trend. PR: Prevalence ratio. CI95%: Confidence interval of 95%.			< 0.001^* * P-value of Wald test for linear trend. PR: Prevalence ratio. CI95%: Confidence interval of 95%.
	18-19	48.9	1.58	1.23-2.04		1.65	1.27-2.14
	20-24	47.2	1.52	1.24-1.88		1.55	1.24-1.93
	25-29	32.1	1.04	0.78-1.37		1.01	0.75-1.36
	≥ 30	30.9	1.00			1.00
Household income					0.057^* * P-value of Wald test for linear trend. PR: Prevalence ratio. CI95%: Confidence interval of 95%.			0.058^* * P-value of Wald test for linear trend. PR: Prevalence ratio. CI95%: Confidence interval of 95%.
	1st quartile	45.9	1.21	0.99-1.47		1.22	1.00-1.49
	2nd quartile	41.6	1.10	0.90-1.33		1.13	0.93-1.38
	3rd quartile	39.9	1.05	0.85-1.30		1.10	0.89-1.35
	4th quartile	38.0	1.00			1.00
Current marital status					< 0.001			< 0.001
	Without a partner	64.3	3.36	2.66-4.25		3.22	2.43-4.25
	Dating	35.6	1.86	1.44-2.41		1.98	1.47-2.67
	Married or with a partner / Living	19.1	1.00			1.00
	together
Living with…					< 0.001			0.120
	Alone	45.6	1.21	0.99-1.47		0.84	0.68-1.04
	Family	37.8	1.00			1.00
	Friends, boarding school or student house	55.2	1.35	1.17-1.58		0.88	0.75-1.03
Age at first sexual intercourse (years)					< 0.001^* * P-value of Wald test for linear trend. PR: Prevalence ratio. CI95%: Confidence interval of 95%.			< 0.001^* * P-value of Wald test for linear trend. PR: Prevalence ratio. CI95%: Confidence interval of 95%.
	≤ 14	29.3	1.00			1.00
	15 to 17	42.0	1.44	1.13-1.83		1.34	1.06-1.70
	≥ 18	46.5	1.59	1.24-2.04		1.63	1.27-2.08
Condom in first sexual intercourse					< 0.001			< 0.001
	No	27.5	1.00			1.00
	Yes	46.6	1.69	1.40-2.05		1.42	1.17-1.71
Number of sexual partners in the last month					< 0.001			0.009
	None	72.1	1.00			1.00
	Um	33.2	0.46	0.40-0.52		0.78	0.66-0.92
	Two or more	66.7	0.92	0.78-1.10		1.00	0.82-1.22
Type of partner in the last sexual intercourse					< 0.001			0.004
	Steady partner	31.6	1.00			1.00
	Casual partner	72.9	2.30	2.05-2.59		1.38	1.11-1.71

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[TFN4] ^*
The total number of the sample is 1,215. However, depending on the ignored values for each exposure variable, the total sum of the categories can result in a value smaller than the sample size.

[TFN5] ^†
Percentage calculated based on the number of respondents.