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Table 2 Availability of additional linked attainment data according to presence/absence of KS4 data among the 13,975 subjects from ALSPAC included in this analysis

From: Multiple imputation using linked proxy outcome data resulted in important bias reduction and efficiency gains: a simulation study

  KS2 data available
Yes No
KS4 data = yes (11,414)   
 KS3 data available   
  Yes 9152 339
  No 1511 412
KS4 data = No   
 KS3 data available   
  Yes 79 10
  No 473 1999