Table 1

Three archetypal screening rules for growth monitoring with their definition, scenario parameters, interpretation, default parameter values according to the Dutch consensus guidelines,7 and the parameter values used in the simulation

Screening ruleDefinitionParameterInterpretationDefault value*Simulation values
*According to Dutch consensus guidelines.
†The Dutch consensus guidelines are ambiguous.
‡The Dutch consensus guidelines require that three measurements should have been taken, each at least one half a year apart.
Absolute height SDSFor ages 0 to p years, refer if SDS < a a SDS referral level before age p−2.5−1.5, −2, −2.5, −3, −3.5, −4
For ages p to 10 years, refer if SDS < b b SDS referral level after age p−2.5−1, −1.5, −2, −2.5, −3
p Age (in years) at which the referral level changesUnspecified1, 2, 3
Parental height correctedFor ages q to 10 years, refer if: c SDS cut off level below which SDS must lie−1.3−1, −1.3, −1.5, −2, −2.5
SDS < c, AND d Difference between target height SDS and SDS−1.3−1, −1.3, −1.5, −2, −2.5
SDS − THSDS < d q Age (in years) after which the rule is effective0, 3†1, 2, 3
DeflectionFor any pair SDS1 and SDS2 measured at ages X1 and X2 (in years), refer if:
r ⩽ X1 < X2 < 10, AND e Minimal interval (in years) between X1 and X21‡1, 2, 3
X2–X1e, AND f SDS cut off level below which SDS2 must lieUnspecified10, 0, −1, −2, −2.5
SDS2 < f, AND g Height velocity change in SDS per year−0.25−0.20, −0.25,−0.33, −0.50
(SDS2–SDS1)/(X2−X1) < g r Age (in years) after which the rule is effective0, 3†3