Table 1 Baseline characteristics of selected 2241 pairs with locoregionally advanced nasopharyngeal carcinoma

Gender

0.838^a

 Male

585 (26.1)

579 (25.8)

 Female

1656 (73.9)

1662 (74.2)

Age (years)

0.791^b

 Median (range)

44 (18–77)

45 (18–76)

Smoking

0.828^a

 Yes

819 (36.5)

812 (36.2)

 No

1422 (63.5)

1429 (63.8)

Drinking

0.703^a

 Yes

321 (14.3)

330 (14.7)

 No

1920 (85.7)

1911 (85.3)

Family History of cancer

0.606^a

 Yes

572 (25.5)

557 (24.9)

 No

1669 (74.5)

1684 (75.1)

T category ^c

0.208^a

 T1

107 (4.8)

136 (6.0)

 T2

179 (8.0)

176 (7.9)

 T3

1461 (65.2)

1416 (63.2)

 T4

494 (22.0)

513 (22.9)

N category ^c

0.03^a

 N0

186 (8.3)

188 (8.4)

 N1

1151 (51.4)

1138 (50.8)

 N2

635 (28.3)

699 (31.2)

 N3

269 (12.0)

216 (9.6)

Overall stage ^c

0.501^a

 III

1516 (67.6)

1537 (68.6)

 IVA-B

725 (32.4)

704 (31.4)

LDH (U/L)

0.204^b

 Median (range)

174 (67–1009)

176 (39–753)

0.141^b

 Median (range)

6345 (0–13,100,000)

4610 (0–9,080,000)