From: Screening rules for growth to detect celiac disease: A case-control simulation study
Screening rule | Definition | Parameter | Interpretation | Simulation values |
---|---|---|---|---|
Delta rule*^ | For ages e 1 to 2.5 years, refer if | e 1 | Age (in years) after which the rule is effective | 0, 0.5, 1 |
(SDS2 – SDS1) <g 1 | g 1 | Change in SDS | -0.5,-1,-1.5,-2,-2.5,-3 | |
Extended delta rule* | For ages e 2 to 2.5 years, refer if | e 2 | Age (in years) after which the rule is effective | 0, 0.5, 1 |
SDS2<f 1, AND | f 1 | SDS cut off level below which the SDS2 must lie | -1,-1.3, -1.5,-2, -2.5 | |
(SDS2 – SDS1) <g 2 | g 2 | Change in SDS | -0.5,-1,-1.5,-2,-2.5,-3 | |
Slowed growth * | For ages e 3 to 2.5 years, AND | e 3 | Age (in years) after which the rule is effective | 0, 0.5, 1 |
X2 – X1 ≥ 3/12 refer if | Minimal three months interval between ages X1 and X2 | |||
SDS2<f 2, AND | f 2 | SDS cut off level below which the SDS2 must lie | -1,-1.3, -1.5,-2, -2.5 | |
(SDS2- SDS1)/(X2-X1) < g3 | g 3 | Change in SDS per year | -0.5,-1,-1.5,-2,-2.5 | |
Conditional weight gain rule | For ages e 4 to 2.5 years, refer if | e 4 | Age (in years) after which the rule is effective | 0, 0.5, 1 |
weight SDS2 <f 3 AND | f 3 | SDS cut off level below which SDS2 must lie | -1,-1.3, -1.5,-2, -2.5 | |
weight SDSgain = (weight SDS2 – r weight SDS1)/(√1-r2) <g 4 | g 4 | Change in SDS | -0.5,-1,-1.5,-2,-2.5 | |
Absolute SDS rule* | For ages 0 to e 5 years, refer if | e 5 | Age (in years) at which the referral level changes | 0, 0.5, 1 |
SDS <f 4 | f 4 | SDS cut off level before age e 5 | -1, -1.3, -1.5, -2, -2.5, -3, -3.5 | |
For ages e 5 to 2.5 years, refer if SDS <f 5 | f 5 | SDS cut off level after age e 5 | -1, -1.3, -1.5, -2, -2.5, -3 | |
Parental height corrected rule | For ages e 6 to 2.5 years, refer if | e 6 | Age (in years) after which the rule is effective | 0, 0.5, 1 |
length SDS <f 6, AND | f 6 | Length SDS must lie below this cut off level | -1, -1.3, -1.5, -2, -2.5 | |
length SDS – TH SDS <g 5 | g 5 | Difference between length SDS and target height (TH) SDS | -1, -1.3, -1.5, -2, -2.5 | |
Parental height deflection rule | For ages e 7 to 2.5 years, refer if | e 7 | Age (in years) after which the rule is effective | 0, 0.5, 1 |
(length SDS2 – length SDS1) <g 6, AND | length SDS2 – TH SDS | > | length SDS1 – TH SDS | | g 6 | Change in length SDS Length SDS at age X1 is closer to it's target height than length SDS at age X2 | -0.5,-1,-1.5,-2,-2.5,-3 | |
Combined weight and length deflection rule | For ages e 8 to 2.5 years, AND | e 8 | Age (in years) after which the rule is effective | 0, 0.5, 1 |
(weight SDS2 – weight SDS1) <g 7, AND | g 7 | Weight change in SDS | -0.25,-0.5,-1,-1.5,-2 | |
(length SDS2 – length SDS1) <g 8, AND Y1 > X1 | g 8 | Length change in SDS Starting point length deflection (Y1) after starting point weight deflection (X1) | -0.25,-0.5,-1,-1.5,-2 |