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Table 3 Modelled student and school level characteristics associated with linkage success

From: Sources of potential bias when combining routine data linkage and a national survey of secondary school-aged children: a record linkage study

  n (%) Linked (%) OR (95% CIs) Wald test AOR (95% CIs)  
Student-level
 Gender
  Males 4654 (50.4) 3315 (51.5) 1.00   1.00  
  Female 4465 (48.4) 3098 (48.1) 0.91 [0.82, 1.00]   0.94 [0.85, 1.04]  
  Did not want to answer 113 (1.2) 28 (0.4) 0.11 [0.07, 0.18] X2(2) = 31.55 0.19 [0.12, 0.32] X2(2) = 40.33
 School grade
  Year 7 1980 (21.4) 1538 (23.9) 1.00   1.00  
  Year 8 2125 (23.0) 1608 (25.0) 0.89 [0.76, 1.04]   0.89 [0.75, 1.05]  
  Year 9 1969 (21.3) 1360 (21.1) 0.63 [0.54, 0.73]   0.62 [0.53, 0.73]  
  Year 10 1696 (18.4) 1023 (15.9) 0.43 [0.37, 0.5]   0.43 [0.36, 0.50]  
  Year 11 1462 (15.8) 912 (14.2) 0.41 [0.35, 0.48] X2(4) = 212.34 0.39 [0.33, 0.47] X2(4) = 189.57
SWEMWBS (sd.) 22.449 (4.24) 22.651 (4.19) 1.04 [1.03, 1.05]   1.03 [1.01, 1.04]  
FAS (sd.) 9.484 (2.27) 9.504 (2.24) 1.00 [0.98, 1.03]   1.00 [0.97, 1.02]  
School-level
 Mean FAS (sd.) 9.484 (0.51) 9.499 (0.52) 1.11 [0.75, 1.63]   1.15 [0.76, 1.76]  
ICC – constant only 0.119      
ICC – Student level 0.128      
ICC – Level 1 & 2 variables 0.126      
  1. n = 9232 (adjusted model n = 8401); schools = 39; observations per school: min = 41; max = 817; P < 0.05 Intraclass correlation coefficient (ICC)
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