Table 1.

NSABP DMP-1 participant characteristics

Submitted questionnaire(s)a
Full cohort (N = 1,023)Submitted Q1 and Q2 (n = 795)Submitted only Q1 (n = 104)Total (n = 899)Ineligible or did not submit Q1 (n = 124)
CharacteristicsNo. (%)No. (%)No. (%)Pb,cNo. (%)No. (%)Pb,d
Age, y
 ≤49403 (39.4)305 (38.4)43 (41.3)0.81348 (38.7)55 (44.4)0.38
 50–59384 (37.5)307 (38.6)37 (35.6)344 (38.3)40 (32.3)
 ≥60236 (23.1)183 (23.0)24 (23.1)207 (23.0)29 (23.4)
Race as reported by the site
 White903 (88.3)711 (89.4)88 (84.6)0.12799 (88.9)104 (83.9)0.01
 Black/African American73 (7.1)47 (5.9)10 (9.6)57 (6.3)16 (12.9)
 Other31 (3.0)24 (3.0)6 (5.8)30 (3.3)1 (0.8)
 Unknown16 (1.6)13 (1.6)0 (0.0)13 (1.4)3 (2.4)
Ethnicity as reported by the site
 Hispanic or Latina51 (5.0)38 (4.8)7 (6.7)0.3745 (5.0)6 (4.8)0.98
 Not Hispanic or Latina951 (93.0)746 (93.8)94 (90.4)840 (93.4)111 (89.5)
 Unknown21 (2.1)11 (1.4)3 (2.9)14 (1.6)7 (5.6)
Menopausal status
 Premenopausal367 (35.9)282 (35.5)33 (31.7)0.45315 (35.0)52 (41.9)0.13
 Postmenopausal656 (64.1)513 (64.5)71 (68.3)584 (65.0)72 (58.1)
Quartiles of 5-y Gail risk scoree
 ≤2.26195 (24.5)31 (29.8)0.57226 (25.1)
 >2.26, ≤3.14201 (25.3)26 (25.0)227 (25.3)
 >3.14, ≤4.62202 (25.4)21 (20.2)223 (24.8)
 >4.62197 (24.8)26 (25.0)223 (24.8)
  • aAmong eligible participants.

  • bPearson χ2 test, unknowns were excluded for calculation of P values.

  • cComparing participants who submitted only Q1 to those who submitted Q1 and Q2.

  • dComparing eligible participants who submitted Q1 to all other participants.

  • eThe information required to calculate Gail score was collected on Q1.