A Factor Analysis Model for Rapid Evaluation of the Semen Quality of Fertile Men in China

Figures & data

Table 1 Analysis of Demographic Characteristics

Characteristics	n	%	Characteristics	n	%
<25 (years)	254	22.43	Researchers	340	30.05
25~30 (years)	660	58.31	Other	41	3.62
>30 (years)	218	19.26	Primary school and below	34	3.00
Farmers	57	5.03	Junior middle school	452	39.90
Workers	228	20.14	High school	310	27.40
Self-employed	135	11.90	Junior college	223	19.70
Police	331	29.20	Bachelor degree or above	113	10.00

Table 2 Descriptive Statistical Analysis of Semen Quality Indexes

Semen Quality Indexes	Sample Size	Mean Value	Standard Deviation	Maximum	Minimum	Abnormal Rate
Semen volume	1132	3.02	1.11	7.10	1.00	3.20%
Sperm motility	1132	51.22	12.14	83.00	10.00	19.40%
Forward motile sperm rate	1132	43.70	12.82	1.67	77.42	16.50%
Semen concentration	1132	57.99	34.06	213.00	2.00	4.20%
Total sperm count	1132	175.57	34.06	979.60	4.40	5.20%

Figure 1 Pearson’s correlation coefficient was performed to analyze the correlations of semen quality indicators using the correlation function in the Performance Analytics package of the R language (**P<0.01, ***P<0.001).

Figure 2 The factor load diagram was obtained using the principal function in the psych package of the R language.

Table 3 Descriptive Statistical Analysis of Influencing Factors and Variables

Variable	Groups	n	First Common Factor Mean Value	Standard Deviation	p	Second Common Factor Mean Value	Standard Deviation	p
Age	<25 (years)	254	−0.07	1.02	0.166	−0.04	1.01	0.58
	25~30 (years)	660	0.02	1.02		0.02	0.97
	>30 (years)	218	0.08	0. 94		0.04	1.06
BMI	<18.5	115	−0.08	0.99	0.408	−0.22	1.13	0.042
	18.5~23.9	807	0.02	0.98		0.03	0.98
	>24	210	−0.05	1.08		0.004	1.02
Location	City	428	0.06	0.99	0.078	−0.03	1.02	0.16
	Countryside	644	−0.01	0.97		0.05	0.98
	Urban Fringe	160	−0.15	1.01		−0.11	1.00
Abstinence days	1~2 days	226	−0.16	0.96	0.001	−0.10	1.00	0.036
	3~4 days	498	−0.03	0.96		−0.01	0.99
	5~7 days	408	0.14	1.06		0.07	1.01
First spermatorrhea	<13 (years)	183	−0.07	0.87	0.006	−0.06	1.00	0.678
	13~14 (years)	396	−0.10	0.97		0.02	0.99
	≥15 (years)	553	0.10	1.05		0.01	1.01
Sexual intercourse frequency	1~2 times/week	691	0.59	0.97	0.002	0.005	0.96	0.66
	3~4 times/week	418	0.07	1.03		−0.001	1.03
	≥5 times/week	23	−0.06	1.38		−0.05	0.84
Satisfaction	Dissatisfied	32	−0.29	0.88	0.000	−0.05	0.73	0.068
	General	342	−0.17	0.90		−0.08	0.97
	Satisfied	758	0.09	1.04		0.03	1.02
Smoking	Yes	405	−0.03	0.44	0.034	−0.04	0.43	0.093
	No	727	0.02	0.33		0.02	0.68
Drinking	Yes	607	−0.03	0.57	0.041	−0.04	1.02	0.145
	No	525	0.04	0.68		0.05	0.98

Notes: The two samples were compared by independent sample t-test, the difference between groups was analyzed by one-way ANOVA, and the Bonferroni method was used for multiple comparisons.