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Table 2 Descriptive statistics of the newly formed control and intervention groups. Each group consists of 12 territories

From: Use of a Geographic Information System to create treatment groups for group-randomized community trials: The Minnesota Heart Health Program

  Intervention Control
Variables used in balancing territories
 # Health systems, range 3–5 2–5
 # Clinics, total 144 123
 Target age groupa
  # Women 15,755 (976) 16,129 (949)
  # Men 18,827 (1518) 19,190 (1380)
 Target education groupb
  # Women 11,227 (634) 11,236 (474)
  # Men 10,259 (468) 10,366 (703)
Variables not used in balancing territories
 Sex (%)
  Women 49.5 (0.7) 49.9 (0.4)
  Men 50.5 (0.7) 50.1 (0.4)
 Median age, years
  Women 43.7 (3.3) 44.1 (4.7)
  Men 42.3 (3.5) 43.3 (4.4)
 Education level
  # Less than high school 5706 (1335) 5673 (1611)
  # High school 37,416 (5497) 36,307 (6613)
  # College 19,444 (2485) 18,226 (4969)
  # Postgraduate/professional 4556 (1363) 4144 (1359)
 Average income ($US) 69,611 (3069) 65,682 (9600)
 # Married 47,517 (13,293) 46,298 (17,514)
  1. Values are mean (SD), unless noted otherwise
  2. # number
  3. aMen aged 45–79 years, women aged 55–79 years
  4. bAt least some college education