Skip to main content

Table 5 Follow-up visits: estimated visit dates and corresponding window limits

From: A randomised controlled trial comparing palate surgery at 6 months versus 12 months of age (the TOPS trial): a statistical analysis plan

Time point Estimated visit date, calculated from date of birth Window limits of estimated visit date
Earliest Latest
12 months 52 weeks1 6 months arm:
− 4 weeks
+ 48 weeks (equivalent to 23 months of age)2
12 months arm:
− 2 weeks
3 years 156 weeks − 4 weeks + 48 weeks (equivalent to 3 years 11 months of age)
5 years 260 weeks − 4 weeks + 48 weeks (equivalent to 5 years 11 months of age)
  1. 1Corrected for gestational age. Full term is defined as day 1 of the 40th week of pregnancy
  2. 2Speech assessments vary in their latest acceptable date:
  3. • Six months surgery patients should have their speech assessed by + 26 weeks (equivalent to 18 months of age)
  4. • Twelve months surgery should have their speech assessed before surgery
\