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Table 1 Study population characteristics

From: Utilization of ultrasonography to detect developmental dysplasia of the hip: when reality turns selective screening into universal use

Variable Total Male Female P Value
Infants (N = 115,918)
 Birth cohort 115,918 59,779 (51.6%) 56,139 (48.4%) --
 Mean age (months) 2.2 (±1.28) 2.21 (±1.24) 2.23 (±1.33) <0.001
 Initial USa 67,491 (58.2%) 33,472 (56.0%) 34,019 (60.6%) <0.001
 Positive US 625 (0.93%) 81 (0.24%) 544 (1.60%) <0.001
Physicians (N = 487)
  General Practitioners (N = 50) Pediatricians (N = 437)  
 Practice volume 5110 (4.4%) 110,289 (95.6%) --
 Mean practice volume 100 (±58.5) 252 (±185.5) --
 Initial referral 1790 65,701 --
 Referrals as a proportion of practice volume 35.0% 59.6% <0.001
 Positive US 19 (1.06%) 606 (0.92%) 0.631
  1. a US = ultrasonography