diff --git a/src/DTOs/PopulationMaternityDTO.ts b/src/DTOs/PopulationMaternityDTO.ts
index 940f618adef39ceaa551e8dd37fc6ee7dc413407..c47f4730af1b3aa2a7067e455b31291ff6c45ce7 100644
--- a/src/DTOs/PopulationMaternityDTO.ts
+++ b/src/DTOs/PopulationMaternityDTO.ts
@@ -1,5 +1,6 @@
 type PopulationMaternity = {
   countryBirthRate: number;
+  countryWomenInAgeGroup: number;
   countryPopulation: number;
 };
 
diff --git a/src/Enum/AgeBracket.ts b/src/Enum/AgeBracket.ts
index 2017b243bce735fb12ad292cb427a43e10f9d5a0..4d9fdbbca68fddfcca9731f76048ccfefbf91dfe 100644
--- a/src/Enum/AgeBracket.ts
+++ b/src/Enum/AgeBracket.ts
@@ -11,7 +11,7 @@ enum AgeBracket {
   m9 = '9 meses',
   m10 = '10 meses',
   m11 = '11 meses',
-  a1 = '1 año',
+  a1 = '1 años',
   a2 = '2 años',
   a3 = '3 años',
   a4 = '4 años',
diff --git a/src/Services/ERCalculator.ts b/src/Services/ERCalculator.ts
index 3a3513adfbb7360e8542761c3e07fc6c8c2d4973..f9af891fd6c66b6ac307a3b7df9d0c80305cd10b 100644
--- a/src/Services/ERCalculator.ts
+++ b/src/Services/ERCalculator.ts
@@ -13,7 +13,7 @@ import ParserService from './ParserService';
 
 // eslint-disable-next-line max-len
 const isIndividualMaternity = (obj: IndividualMaternity | PopulationMaternity): obj is IndividualMaternity => {
-  if ((obj as IndividualMaternity).pregnantWomen) {
+  if ((obj as IndividualMaternity).pregnantWomen !== undefined) {
     return true;
   }
   return false;
@@ -23,9 +23,9 @@ const isIndividualMaternity = (obj: IndividualMaternity | PopulationMaternity):
 const calculateTEE = (group: AgeGroup, params: number[], preval: MinorPAL): number => {
   const teeModerate: number = params[0]
   + (params[1] * group.medianWeight)
-  - params[2] * (group.medianWeight * group.medianWeight);
+  + params[2] * (group.medianWeight * group.medianWeight);
 
-  const teeLow: number = teeModerate - (teeModerate * params[4]) / 100;
+  const teeLow: number = teeModerate + (teeModerate * params[4]) / 100;
   const teeIntense: number = teeModerate + (teeModerate * params[5]) / 100;
 
   const ret: number = (teeLow * preval.lowPALPrevalence) / 100
@@ -66,11 +66,11 @@ const calculateERWomenIndividual = (group: AgeGroup, params: number[], popData:
 };
 
 // eslint-disable-next-line max-len
-const calculateERWomenPopulation = (group: AgeGroup, params: number[], popData: PopulationMaternity, req: number): number => {
-  const annualBirths = popData.countryBirthRate * popData.countryPopulation;
+const calculateERWomenPopulation = (params: number[], popData: PopulationMaternity, req: number): number => {
+  const annualBirths = (popData.countryBirthRate * popData.countryPopulation) / 1000;
 
-  const percentPregnantWomen = (annualBirths * 75) / group.population;
-  const percentLactatingWomen = (annualBirths * 50) / group.population;
+  const percentPregnantWomen = (annualBirths * 75) / popData.countryWomenInAgeGroup;
+  const percentLactatingWomen = (annualBirths * 50) / popData.countryWomenInAgeGroup;
 
   const reqPregnantWomen = (percentPregnantWomen * (req + params[6])) / 100;
   const reqLactatingWomen = (percentLactatingWomen * (req + params[7])) / 100;
@@ -147,7 +147,7 @@ const calculate18To29Years = (group: AgeGroup, params: number[], data: ExtraData
     } else if (isIndividualMaternity(data.maternity18To29)) {
       requirement = calculateERWomenIndividual(group, params, data.maternity18To29, requirement);
     } else {
-      requirement = calculateERWomenPopulation(group, params, data.maternity18To29, requirement);
+      requirement = calculateERWomenPopulation(params, data.maternity18To29, requirement);
     }
   }
 
@@ -181,7 +181,7 @@ const calculate30To59Years = (group: AgeGroup, params: number[], data: ExtraData
     } else if (isIndividualMaternity(data.maternity30To59)) {
       requirement = calculateERWomenIndividual(group, params, data.maternity30To59, requirement);
     } else {
-      requirement = calculateERWomenPopulation(group, params, data.maternity30To59, requirement);
+      requirement = calculateERWomenPopulation(params, data.maternity30To59, requirement);
     }
   }
 
diff --git a/src/Services/ParameterService.ts b/src/Services/ParameterService.ts
index 30f6085b228efb7e6534bcad8818c630f1bf9916..41469c5ef27a065ceb36d291ca53f62d2821a524 100644
--- a/src/Services/ParameterService.ts
+++ b/src/Services/ParameterService.ts
@@ -179,120 +179,120 @@ const getEquationValues = (ageBracket: AgeBracket, sex: Sex): number[] => {
     case (AgeBracket.a6): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 11, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 12, 15, 15];
+        res = [310.2, 63.3, -0.263, 12, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 10, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 13, 15, 15];
+        res = [263.4, 65.3, -0.454, 13, -15, 15];
       }
       break;
     }
     case (AgeBracket.a7): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 14, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 14, 15, 15];
+        res = [310.2, 63.3, -0.263, 14, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 17, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 17, 15, 15];
+        res = [263.4, 65.3, -0.454, 17, -15, 15];
       }
       break;
     }
     case (AgeBracket.a8): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 16, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 16, 15, 15];
+        res = [310.2, 63.3, -0.263, 16, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 20, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 20, 15, 15];
+        res = [263.4, 65.3, -0.454, 20, -15, 15];
       }
       break;
     }
     case (AgeBracket.a9): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 19, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 19, 15, 15];
+        res = [310.2, 63.3, -0.263, 19, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 23, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 23, 15, 15];
+        res = [263.4, 65.3, -0.454, 23, -15, 15];
       }
       break;
     }
     case (AgeBracket.a10): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 22, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 22, 15, 15];
+        res = [310.2, 63.3, -0.263, 22, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 25, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 25, 15, 15];
+        res = [263.4, 65.3, -0.454, 25, -15, 15];
       }
       break;
     }
     case (AgeBracket.a11): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 25, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 25, 15, 15];
+        res = [310.2, 63.3, -0.263, 25, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 25, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 25, 15, 15];
+        res = [263.4, 65.3, -0.454, 25, -15, 15];
       }
       break;
     }
     case (AgeBracket.a12): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 29, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 29, 15, 15];
+        res = [310.2, 63.3, -0.263, 29, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 26, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 26, 15, 15];
+        res = [263.4, 65.3, -0.454, 26, -15, 15];
       }
       break;
     }
     case (AgeBracket.a13): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 33, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 33, 15, 15];
+        res = [310.2, 63.3, -0.263, 33, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 24, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 24, 15, 15];
+        res = [263.4, 65.3, -0.454, 24, -15, 15];
       }
       break;
     }
     case (AgeBracket.a14): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 33, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 33, 15, 15];
+        res = [310.2, 63.3, -0.263, 33, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 19, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 19, 15, 15];
+        res = [263.4, 65.3, -0.454, 19, -15, 15];
       }
       break;
     }
     case (AgeBracket.a15): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 31, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 31, 15, 15];
+        res = [310.2, 63.3, -0.263, 31, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 13, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 13, 15, 15];
+        res = [263.4, 65.3, -0.454, 13, -15, 15];
       }
       break;
     }
     case (AgeBracket.a16): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 24, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 24, 15, 15];
+        res = [310.2, 63.3, -0.263, 24, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 5, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 5, 15, 15];
+        res = [263.4, 65.3, -0.454, 5, -15, 15];
       }
       break;
     }
     case (AgeBracket.a17): {
       if (sex === Sex.Male) {
         // 310.2 + (63.3*MP) - 0.263*MP^2 + 14, -15%/+15% for light/intense TEE
-        res = [310.2, 63.3, -0.263, 14, 15, 15];
+        res = [310.2, 63.3, -0.263, 14, -15, 15];
       } else if (sex === Sex.Female) {
         // 263.4 + (65.3*MP) - 0.454*MP^2 + 0, -15%/+15% for light/intense TEE
-        res = [263.4, 65.3, -0.454, 0, 15, 15];
+        res = [263.4, 65.3, -0.454, 0, -15, 15];
       }
       break;
     }