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Table 2 Comparison of gender composition ratio at all ages in Group A and Group B patients undergoing knee arthroplasty, n (%)

From: Changes in epidemiological characteristics of knee arthroplasty in eastern, northern and central China between 2011 and 2020

Age period (years old)

Group A n, (%)

Group B n, (%)

P value

Male

Female

Male

Female

 ≤ 19

1 (0.1)

0 (0.0)

0 (0.0)

1 (0.0)

0.157

20–29

1 (0.1)

1 (0.0)

6 (0.2)

8 (0.1)

0.849

30–39

2 (0.1)

4 (0.1)

9 (0.2)

17 (0.1)

0.952

40–49

28 (1.7)

112 (1.9)

105 (2.8)

318 (2.6)

0.244

50–59

270 (16.4)

1400 (23.5)

678 (18.0)

2712 (22.2)

0.001

60–69

650 (39.6)

2618 (43.9)

1725 (45.9)

5987 (48.9)

0.004

70–79

604 (36.8)

1674 (28.0)

1082 (28.8)

2914 (23.8)

0.629

80–89

84 (5.1)

155 (2.6)

151 (4.0)

286 (2.3)

0.877

 ≥ 90

1 (0.1)

1 (0.0)

3 (0.1)

2 (0.0)

0.809

Total

1641 (100.0)

5965 (100.0)

3759 (100.0)

12245 (100.0)

0.001