wtf

return {
    dob: date,
    dom: start,
    weight: coef,
    getBMI: format,
    getLMS: extend,
    getPercentile: function() {
        var val = calc();
        /**
         * @param {number} t
         * @return {?}
         */
        var interpolate = function(t) {
            /** @type {number} */
            var x = 0.254829592;
            /** @type {number} */
            var y = -0.284496736;
            /** @type {number} */
            var i = 1.421413741;
            /** @type {number} */
            var c = -1.453152027;
            /** @type {number} */
            var r = 1.061405429;
            /** @type {number} */
            var width = 1 / (1 + 0.3275911 * (t = Math.abs(t)));
            return 1 - ((((r * width + c) * width + i) * width + y) * width + x) * width * Math.exp(-1 * t * t);
        };
        return parseInt(1000 * function(decimalNum) {
            /** @type {number} */
            var HAS_RESOURCE_RADIUS = 1;
            return decimalNum < 0 && (HAS_RESOURCE_RADIUS = -1), 0.5 * (1 + HAS_RESOURCE_RADIUS * interpolate(Math.abs(decimalNum) / Math.sqrt(2)));
        }(val)) / 10;
    },
    lowerSD: function() {
        var self = extend();
        return (self.M - self.M * Math.pow(1 + self.L * self.S * -2, 1 / self.L)) / 2;
    },
    upperSD: function() {
        var self = extend();
        return (self.M * Math.pow(1 + self.L * self.S * 2, 1 / self.L) - self.M) / 2;
    },
    getBalence: function(length) {
        /** @type {string} */
        var status = "Error";
        return length < 5 ? status = "Underweight" : length >= 5 && length <= 85 ? status = "Normal" : length > 85 && length <= 95 ? status = "Overweight" : length > 95 && (status = "Obese"), status;
    }
};
};