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Table 1 Baseline information for the patients with SCC and SC of ovary in the SEER database, N(%)

From: Poorer prognosis of ovarian squamous cell carcinoma than serous carcinoma: a propensity score matching analysis based on the SEER database

  Before matching After matching
Serous (n = 15,106) Squamous (n = 180) P-value Serous (n = 200) Squamous (n = 104) P-value
Age at diagnosis a 62.0 (54.0–71.0) 55.5 (46.0–67.8) < 0.001 58.5 (51.0–65.0) 57.0 (48.0–68.8) 0.745
Tumor size (mm) a 79.0 (45.0–120.0) 90.0 (60.0–145.8) 0.003 95.5 (60.0–138.3) 90.0 (55.0–140.0) 0.727
Year of diagnosis
 ≤2010 7094 (47.0) 107 (59.4) 0.001 108 (54.0) 57 (54.8) 0.893
 > 2010 8012 (53.0) 73 (40.6)   92 (46.0) 47 (45.2)  
Race
 White 12,830 (84.9) 134 (74.4) 0.001 157 (78.5) 86 (82.7) 0.685
 Black 1066 (7.1) 22 (12.2)   22 (11.0) 9 (8.7)  
 Others 1169 (7.7) 23 (12.8)   21 (10.5) 9 (8.7)  
 Unknown 41 (0.3) 1 (0.6)   
Laterality
 Unilateral 8609 (45.1) 172 (95.6) < 0.001 194 (97.0) 101 (97.1) 0.955
 Bilateral 8297 (54.9) 8 (4.4)   6 (3.0) 3 (2.9)  
FIGO stage
 I 1567 (10.4) 64 (35.6) < 0.001 65 (32.5) 32 (30.8) 0.902
 II 1348 (8.9) 39 (21.7)   46 (23.0) 30 (28.8)  
 III 8092 (53.6) 44 (24.4)   60 (30.0) 26 (25.0)  
 IV 4009 (27.1) 33 (18.3)   29 (14.5) 16 (15.4)  
Grade b
 G1/G2 1690 (13.5) 60 (41.1) < 0.001 46 (23.0) 32 (30.8) 0.141
 G3/G4 10,837 (86.5) 86 (58.9)   154 (77.0) 72 (69.2)  
SEER stage
 Localized 833 (5.5) 47 (26.1) < 0.001 32 (16.0) 22 (21.2) 0.448
 Regional 2567 (17.0) 70 (38.9)   101 (50.5) 46 (44.2)  
 Distant 11,706 (77.5) 63 (35.0)   67 (33.5) 36 (34.6)  
  1. a Data were described as median (P25 – P75). b The number of each stratum did not sum to the total number of cohort due to missing values
  2. Abbreviations: SCC squamous cell carcinoma; SC serous carcinoma; SEER Surveillance Epidemiology and End Results Program; FIGO International Federation of Gynecology and Obstetrics