predicting_pefr.ipynb

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   "execution_count": 19,
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     "data": {
      "text/plain": [
       "'\\nhttps://www.mdcalc.com/estimated-expected-peak-expiratory-flow-peak-flow\\n\\nAges 5-7 years and any ethnicity:\\n\\nPEFR = [(Height, cm - 100) × 5] + 100\\n\\nAges 18-80 years, all other ethnicities:\\n\\nPEFR, male = {[(Height, m × 5.48) + 1.58] - [Age × 0.041]} × 60\\n\\nPEFR, female = {[(Height, m × 3.72) + 2.24] - [Age × 0.03]} × 60\\n'"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "\"\"\"\n",
    "https://www.mdcalc.com/estimated-expected-peak-expiratory-flow-peak-flow\n",
    "\n",
    "Ages 5-7 years and any ethnicity:\n",
    "\n",
    "PEFR = [(Height, cm - 100) × 5] + 100\n",
    "\n",
    "Ages 18-80 years, all other ethnicities:\n",
    "\n",
    "PEFR, male = {[(Height, m × 5.48) + 1.58] - [Age × 0.041]} × 60\n",
    "\n",
    "PEFR, female = {[(Height, m × 3.72) + 2.24] - [Age × 0.03]} × 60\n",
    "\"\"\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [],
   "source": [
    "def get_age(prompt):\n",
    "    try:\n",
    "        value = int(input(prompt))\n",
    "    except ValueError:\n",
    "        print(\"Sorry, I didn't understand that.\")\n",
    "        return get_age(prompt)\n",
    "\n",
    "    if value < 5:\n",
    "        print(\"Sorry, you must be at least 5 years old for us to predict your peak expiratory flow rate.\")\n",
    "        return get_age(prompt)\n",
    "    elif value > 80:\n",
    "        print(\"Sorry, you must be less than 80 years old for us to predict your peak expiratory flow rate.\")\n",
    "        return get_age(prompt)\n",
    "    else:\n",
    "        return value"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "metadata": {},
   "outputs": [],
   "source": [
    "def get_height(prompt):\n",
    "    try:\n",
    "        value = int(input(prompt))\n",
    "    except ValueError:\n",
    "        print(\"Sorry, I didn't understand that.\")\n",
    "        return get_height(prompt)\n",
    "\n",
    "    if value < 0:\n",
    "        print(\"Sorry, you must have a positive height in cm for us to predict your peak expiratory flow rate.\")\n",
    "        return get_height(prompt)\n",
    "    elif value > 1000:\n",
    "        print(\"Sorry, you must be less than 1000cm tall for us to predict your peak expiratory flow rate.\")\n",
    "        return get_height(prompt)\n",
    "    else:\n",
    "        return value"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 49,
   "metadata": {},
   "outputs": [],
   "source": [
    "def get_sex(prompt):\n",
    "    try:\n",
    "        value = int(input(prompt))\n",
    "    except ValueError:\n",
    "        print(\"Sorry, I didn't understand that.\")\n",
    "        return get_sex(prompt)\n",
    "\n",
    "    if value == 1:\n",
    "        return value\n",
    "    elif value == 2:\n",
    "        return value\n",
    "    else:\n",
    "        print(\"Sorry, I didn't understand that.\")\n",
    "        return get_sex(prompt)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 80,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Please enter age in years: 37\n",
      "Please enter height in cm: 168\n",
      "Please enter your sex 1=male, 2=female: 1\n"
     ]
    }
   ],
   "source": [
    "age = get_age('Please enter age in years: ')\n",
    "height = get_height('Please enter height in cm: ')\n",
    "sex = get_sex('Please enter your sex 1=male, 2=female: ')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 97,
   "metadata": {},
   "outputs": [],
   "source": [
    "def predicted_pefr(age, height, sex):\n",
    "    if (age >= 5) & (age <= 7):\n",
    "        PEFR = ((height - 100) * 5) + 100\n",
    "    elif sex == 1:\n",
    "        PEFR = ((((height/100) * 5.48) + 1.58) - (age * 0.041)) * 60\n",
    "    elif sex == 2:\n",
    "        PEFR = ((((height/100) * 3.72) + 2.24) - (age * 0.03)) * 60\n",
    "    else:\n",
    "        print(\"Sorry, the input was unexpected\")    \n",
    "    return PEFR"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 98,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "556.1640000000001"
      ]
     },
     "execution_count": 98,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "predicted_pefr(age,height,sex)"
   ]
  }
 ],
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