Table 2 Univariate analysis of prognostic factors in patients with rectal adenocarcinoma undergoing surgery

Age

< 65

2.39 (2.34–2.45)

12.21 (11.95–12.48)

21.55 (21.08–22.02)

0.67 (0.65–0.68)

2.04 (1.99–2.09)

3.39 (3.30–3.47)

≥ 65

7.39 (7.17–7.60)

19.41 (18.88–19.94)

27.43 (26.70–28.16)

3.70 (3.58–3.81)

9.04 (8.76–9.31)

14.39 (13.93–14.85)

Race

White

4.44 (4.37–4.50)

14.92 (14.70–15.14)

23.34 (23.00–23.69)

1.99 (1.96–2.02)

5.04 (4.96–5.12)

8.14 (8.00–8.29)

Black

5.23 (4.39–6.06)

19.36 (16.48–22.25)

30.72 (26.31–35.12)

1.99 (1.66–2.31)

5.53 (4.60–6.47)

8.38 (6.85–9.90)

Other

3.86 (3.41–4.31)

14.10 (12.49–15.71)

23.89 (21.16–26.63)

1.22 (1.07–1.36)

3.63 (3.17–4.09)

6.58 (5.67–7.50)

Sex

Male

4.42 (4.32–4.51)

15.05 (14.75–15.35)

24.28 (23.79–24.76)

1.96 (1.91–2.00)

4.90 (4.79–5.01)

8.19 (7.99–8.38)

Female

4.46 (4.32–4.60)

15.36 (14.90–15.83)

23.51 (22.80–24.22)

1.83 (1.77–1.89)

4.97 (4.80–5.13)

7.70 (7.43–7.98)

MS

Married

3.40 (3.34–3.47)

12.76 (12.51–13.02)

20.87 (20.45–21.29)

1.50 (1.47–1.53)

3.80 (3.72–3.88)

6.51 (6.36–6.67)

Unmarried

6.08 (5.89–6.28)

19.06 (18.49–19.63)

29.00 (28.15–29.85)

2.56 (2.47–2.64)

6.74 (6.51–6.97)

10.40 (10.02–10.78)

AJCC

I

1.76 (1.64–1.87)

4.23 (3.94–4.51)

7.93 (7.36–8.49)

2.00 (1.87–2.13)

5.52 (5.16–5.89)

9.77 (9.09–10.45)

II

2.67 (2.55–2.79)

9.52 (9.09–9.95)

16.42 (15.66–17.19)

1.99 (1.90–2.08)

5.28 (5.04–5.53)

9.30 (8.83–9.76)

III

4.21 (4.08–4.34)

15.74 (15.29–16.20)

26.14 (25.38–26.89)

1.77 (1.71–1.82)

4.56 (4.42–4.71)

6.80 (6.56–7.04)

IV

15.82 (14.06–17.58)

51.47 (47.83–55.11)

70.71 (67.22–74.19)

2.05 (1.78–2.31)

4.21 (3.65–4.77)

5.38 (4.62–6.14)

TS

< 4 cm

2.93 (2.85–3.02)

11.48 (11.15–11.80)

19.47 (18.91–20.02)

1.72 (1.67–1.77)

4.46 (4.33–4.60)

7.28 (7.04–7.51)

4–8 cm

5.15 (5.01–5.28)

17.41 (16.98–17.84)

26.74 (26.09–27.39)

2.16 (2.10–2.22)

5.44 (5.29–5.59)

8.74 (8.48–9.01)

≥ 8 cm

8.40 (7.16–9.64)

22.38 (19.31–25.46)

32.87 (28.38–37.37)

1.41 (1.18–1.63)

4.44 (3.68–5.19)

7.61 (6.18–9.04)

LN

0

2.59 (2.54–2.65)

8.65 (8.47–8.84)

14.74 (14.41–15.06)

1.83 (1.79–1.87)

4.95 (4.84–5.05)

8.73 (8.52–8.94)

1–3

5.19 (4.91–5.46)

19.25 (18.30–20.19)

31.39 (29.92–32.85)

1.98 (1.87–2.09)

4.76 (4.49–5.03)

6.93 (6.51–7.35)

4–8

9.33 (8.27–10.39)

30.34 (27.51–33.17)

44.68 (41.06–48.30)

2.28 (2.00–2.56)

5.59 (4.90–6.28)

7.40 (6.45–8.35)

> 8

15.10 (11.19–19.01)

48.35 (40.20–56.51)

62.11 (53.82–70.40)

1.75 (1.22–2.27)

3.93 (2.74–5.12)

4.99 (3.41–6.57)

Radiation

None

7.95 (7.66–8.24)

20.13 (19.45–20.80)

27.27 (26.37–28.16)

3.47 (3.34–3.61)

8.20 (7.89–8.51)

12.51 (12.02–13.01)

Yes

2.70 (2.65–2.76)

12.71 (12.47–12.95)

22.36 (21.94–22.79)

1.14 (1.11–1.16)

3.29 (3.23–3.36)

5.69 (5.56–5.82)

Chemotherapy

None

7.91 (7.56–8.26)

16.34 (15.66–17.03)

22.00 (21.08–22.91)

3.91 (3.73–4.09)

9.25 (8.83–9.67)

14.26 (13.59–14.92)

Yes

3.13 (3.08–3.19)

14.76 (14.51–15.01)

24.84 (24.42–25.26)

1.15 (1.13–1.17)

3.27 (3.21–3.33)

5.53 (5.41–5.64)