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Table 1 Patient characteristics of the study population in the primary analysis

From: Impact of the interval between neoadjuvant concurrent chemoradiotherapy and esophagectomy in the modern era: a population-based propensity-score-matched retrospective cohort study in Asia

 Unmatched population Matched study population 
Short interval (n = 169)Long interval (n = 87)Short interval (n = 80)Long interval (n = 80)
Number or
mean (sd)
(%)Number or
mean (sd)
(%)SDifNumber or
mean (sd)
(%)Number or
mean (sd)
(%)SDif
Age 54.71 (8.53) 53.21 (8.30) 0.17953.48 (8.62) 52.94 (8.31) 0.063
GenderFemale13(8)5(6)0.0785(6)5(6)0
Male156(92)82(94) 75(94)75(94) 
ResidencyNon-north110(65)46(53)0.25046(57)45(56)0.025
North59(35)41(47) 34(43)35(44) 
Tumor size≤ 5 cm61(36)43(49)0.27235(44)37(46)0.050
> 5 cm108(64)44(51) 45(56)43(54) 
Tumor differentiationPoorly/undifferentiated66(39)15(17)0.50015(19)15(19)0
Well/moderately103(61)72(83) 65(81)65(81) 
RT deliveryNon-IGRT145(86)62(71)0.36062(77)60(75)0.059
IGRT24(14)25(29) 18(23)20(25) 
Use of PETNo14(8)7(8)0.0095(6)7(9)0.095
Yes155(92)80(92) 75(94)73(91) 
Tumor locationCervical0.2200
Non-cervical  
T-stageT1–T221(12)10(11)0.02910(13)10(13)0
T3–T4148(88)77(89) 70(87)70(87) 
N-stageNegative20(12)8(9)0.08614(18)8(10)0.219
Positive149(88)79(91) 66(82)72(90) 
DrinkingNo23(14)7(8)0.1808(10)7(9)0.043
Yes146(86)80(92) 72(90)73(91) 
Betel nut chewingNo75(44)30(34)0.20429(36)28(35)0.026
Yes94(56)57(66) 51(64)52(65) 
SmokingNo24(14)10(11)0.08110(13)10(13)0
Yes145(86)77(89) 70(87)70(87) 
BMI 22.08 (3.34) 22.69 (4.62) 0.15221.91 (3.35) 22.39 (3.32) 0.146
Number of lymph nodes< 1533(20)17(20)020(25)16(20)0.120
≥ 15136(80)70(80) 60(75)64(80) 
RT dose (Gy) 48.30 (3.30) 46.80 (4.06) 0.40547.51 (3.59) 47.16 (3.92) 0.094
  1. BMI body mass index, IGRT image-guided radiotherapy, nCCRT neoadjuvant concurrent chemoradiotherapy, PET positron emission tomography, RT radiotherapy, sd standard deviation, SDif standardized difference
  2. Rounded
  3. The exact numbers were not reported because of a Health and Welfare Data Science Center (HWDC) database center policy to avoid numbers in single cells (≤ 2)