Characteristics

n (%)

Progressive motility (PR, %)

Total motility (PR + NP, %)

Mean ± SD

t/F

P

Mean ± SD

t/F

P

Sperm motility (PR, PR + NP)

349 (100.0)

41.6 ± 20.1

63.4 ± 21.4

Age (years)^a

≤34

169 (48.4)

42.1 ± 19.9

2.809

0.062

63.6 ± 20.1

1.048

0.353

35 - 39

105 (30.1)

44.2 ± 19.9

65.3 ± 20.7

≥40

75 (21.5)

37.1 ± 20.4

60.2 ± 24.9

Ethnicity^a

Han

155 (44.4)

41.1 ± 19.4

0.634

0.531

63.2 ± 20.8

0.935

0.393

Zhuang

148 (42.4)

41.3 ± 21.2

62.4 ± 22.3

Others

46 (13.2)

44.8 ± 19.0

67.3 ± 20.8

Education^a

Junior school and below

176 (50.4)

42.4 ± 20.3

0.717

0.489

64.7 ± 21.4

0.848

0.429

High or technical school

80 (22.9)

39.3 ± 20.4

61.0 ± 21.7

College and above

93 (26.6)

42.3 ± 19.6

62.9 ± 21.2

Job title^a

Industry worker

73 (20.9)

37.1 ± 18.7

3.650

0.027*

57.2 ± 21.9

5.127

0.006*

Farmer

121 (34.7)

40.6 ± 21.3

62.8 ± 22.7

Others

155 (44.4)

44.6 ± 19.4

66.8 ± 19.5

BMI (on WHO criteria, kg/m²)^a

Underweight (<18.5)

19 (5.4)

46.0 ± 17.1

0.458

0.712

67.0 ± 16.2

0.190

0.903

Normal weight (18.5 - 24.9)

217 (62.2)

41.2 ± 20.3

63.2 ± 21.8

Overweight (25.0 - 29.9)

98 (28.1)

42.3 ± 20.8

63.2 ± 21.8

Obese (≥30.0)

15 (4.3)

38.9 ± 16.9

62.6 ± 20.7

BMI (on China criteria, kg/m²)^a

Underweight (<18.5)

19 (5.4)

46.0 ± 17.1

1.447

0.229

67.0 ± 16.2

1.740

0.168

Normal weight (18.5 - 23.9)

178 (51.0)

40.1 ± 20.2

61.7 ± 21.7

Overweight (24.0 - 27.9)

118 (33.8)

44.1 ± 19.8

66.4 ± 20.1

Obese (≥28.0)

34 (9.7)

38.9 ± 21.7

59.6 ± 26.0

With organic reproductive diseases^b

No

267 (76.5)

43.0 ± 20.9

2.467

0.015*

64.6 ± 22.1

1.933

0.054

Yes

82 (23.5)

37.4 ± 16.8

59.4 ± 18.9