Table 1 Patient characteristics for prostate biopsy specimens for men ≤55 years compared to men >55 years

Sample numbers

93 (15.6 %)

505 (84.4 %)

598 (100 %)

X² = 283.9, p < 0.001

Age (years)

 -Median

53

64

63

 -Range

41–55

56–79

41–79

 -Mean

51.9

64.3

62.4

Clinical stage

 cT1c

65 (69.9 %)

341 (67.5 %)

406 (67.9 %)

X² = 0.20, p = 0.65

 cT2a

10 (10.8 %)

64 (12.7 %)

74 (12.4 %)

X² = 0.27, p = 0.61

 cT2b

2 (2.2 %)

25 (5.0 %)

27 (4.5 %)

X² = 1.43, p = 0.23

 cT2c

14 (15.1 %)

73 (14.5 %)

87 (14.5 %)

X² = 0.02, p = 0.88

 cT3a

0 (0 %)

0 (0 %)

0 (0 %)

-

 cT3b

0 (0 %)

1 (0.2 %)

1 (0.2 %)

X² = 0.18, p = 0.67

 Missing

2 (2.2 %)

1 (0.2 %)

3 (0.5 %)

X² = 6.00, p = 0.01

PSA score (ng/mL)

 <3

9 (9.7 %)

43 (8.5 %)

52 (8.7 %)

X² = 0.134, p = 0.72

 3–4

12 (12.9 %)

41 (8.1 %)

53 (8.9 %)

X² = 2.23, p = 0.14

 4.1–10

55 (59.1 %)

342 (67.7 %)

397 (66.4 %)

X² = 2.59, p = 0.11

 10.1–20

14 (15.1 %)

73 (14.5 %)

87 (14.5 %)

X² = 0.23, p = 0.88

 >20.1

3 (3.2 %)

6 (1.2 %)

9 (1.5 %)

X² = 2.2, p = 0.14

Gleason score

 3 + 3

32 (34.4 %)

135 (26.7 %)

167 (27.9 %)

X² = 2.3, p = 0.13

 3 + 4

39 (41.9 %)

231 (45.7 %)

270 (45.2 %)

X² = 0.46, p = 0.50

 4 + 3

13 (14.0 %)

69 (13.7 %)

82 (13.7 %)

X² = 0.007, p = 0.94

 8

5 (5.4 %)

29 (5.7 %)

34 (5.7 %)

X² = 0.02, p = 0.89

 9–10

4 (4.3 %)

41 (8.1 %)

45 (7.5 %)

X² = 1.65, p = 0.20

Biopsy

 No. cores mean

14.3

13.9

13.9

t = 1.17, p = 0.24, Mean difference = 0.48, 95 % CI of difference = −0.33 to 1.30

 % of positive cores mean

31

34

34

t = −1.51, p = 0.13, Mean difference = −3.73, 95 % CI of difference = −8.58 to 1.11