Table 2

The age when Meanobs = SDobs* for weight or length increment and the probability (%) of seeing no growth at age 12 months, depending on the amount of noise in the measurement. and the time interval.

Interval sizeAge (months) when
Chance of no growth at 12 months
2 weeks4 weeks8 weeks2 weeks4 weeks8 weeks
WeightSD as observed1012>1221%15%6%
SD with extra noise610>1230%20%10%
LengthSD as observed>12>12>1212%6%1%
SD with extra noise512>1224%16%3%
  • *When chance of no growth reaches 16%.

  • Meanobs, observed mean; SDobs, observed SD.