Table 2 Results of univariate and multivariate analyses

Age at radiotherapy

0.393

0.162

 66 years or less

47.2 (38.7–55.9)

 More than 66 years

39.4 (30.5–49.1)

Gender

0.100

0.215

 Male

41.2 (34.6–48.1)

 Female

58.1 (40.8–73.7)

Performance status

0.008

0.655

 0

48.7 (33.1–64.6)

 1

44.3 (36.7–52.1)

 2

22.3 (9.5–44.1)

Primary site

0.714

0.810

 Upper thoracic esophagus

38.9 (24.4–55.7)

 Middle thoracic esophagus

42.9 (34.4–51.9)

 Lower thoracic esophagus

46.6 (35.7–57.8)

Stage

<0.001

<0.001

 II

64.0 (52.5–74.2)

 III (non-T4)

40.1 (31.0–49.9)

 III (T4)

22.5 (13.7–35.5)

Protocol

0.082

0.043

 Group A

52.4 (35.0–69.3)

 Group B

45.2 (37.0–53.6)

 Group C

37.2 (26.8–48.8)

Radiotherapy dose

0.090

0.973

 60 Gy or less

46.0 (28.1–51.2)

 More than 60 Gy

39.1 (38.7–53.5)

Concomitant chemotherapy

<0.001

<0.001

 1 cycle

27.9 (14.5–46.9)

 2 cycles

46.0 (39.3–52.8)

Adjuvant chemotherapy

0.885

0.306

 With

45.1 (38.1–52.5)

 Without

38.8 (26.8–52.3)