MediaWiki:Gadget-calculator-anatomyPhysiology.js

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( function() {
    mw.calculators.addCalculations( {
        bmi: {
            abbreviation: 'BMI',
            digits: 1,
            formula: '\\mathrm{BMI} = \\frac{\\text{mass}_\\text{kg}}{{\\text{height}_\\text{m}}^2}',
            link: false,
            name: 'Body mass index',
            references: [],
            units: 'kg/m^2',
            variables: {
                required: [ 'weight', 'height' ]
            },
            calculate: function( data ) {
                return data.weight.toNumber( 'kgwt' ) / Math.pow( data.height.toNumber( 'm' ), 2 );
            }
        },
        ibw: {
            abbreviation: 'IBW',
            digits: 1,
            link: 'https://en.wikipedia.org/wiki/Human_body_weight#Ideal_body_weight',
            name: 'Ideal body weight',
            references: [
                'Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm. 1974;8:650–655.'
            ],
            units: 'kg',
            variables: {
                required: [ 'height', 'gender' ]
            },
            calculate: function( data ) {
                if( data.height.toNumber( 'cm' ) < 152 ) {
                    throw new Error( 'Ideal body weight may only be applied to persons 152 cm (60 inches) or taller' );
                }

                var baseWeight = data.gender === 'F' ? 45.5 : 50;

                // baseWeight + 2.3 kg for every inch over 5 feet
                return baseWeight + 2.3 * ( data.height.toNumber( 'in' ) - 60 );
            }
        },
        ettSize: {
            abbreviation: 'ETT size',
            digits: 1,
            name: 'Endotracheal tube size',
            references: [
                'Smith\'s Anesthesia for Infants and Children. 8e. p356'
            ],
            variables: {
                required: [ 'age' ],
                optional: [ 'height' ]
            },
            calculate: function( data ) {
                const age = data.age.toNumber( 'yo' );

                if( age >= 12 ) {
                    return '7?';
                } else if( age >= 1 ) {
                    // ( age + 16 ) / 4
                    // To nicely display in increments of 0.5, double the calculation, round (floor), then divide by 2
                    return String( Math.floor( 2 * ( ( age + 16 ) / 4 ) ) / 2 );
                } else if (age >= 0.5 ) {
                    return '3.5-4';
                } else if( age >= 0 ) {
                    return '3-3.5';
                } else {
                    return '2.5-3';
                }
            },
            renderLabel: function( options ) {
                // Link only ETT/Endotracheal tube
                return 'woo';
            }
        }
    } );
}() );