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# Table 1 Description of variables and parameters

From: Sensitivity and mathematical model analysis on secondhand smoking tobacco

No | Variables/parameters | Description | Value |
---|---|---|---|

1 |
P
| The number people who have a risk of smoking | \(P\ge 0\) |

2 |
S
| The number people who are smoking tobacco | \(S\ge 0\) |

3 |
Q
| The number of people who have stopped smoking | \(Q\ge 0\) |

4 | \(\alpha\) | The number of healthy people who become at risk of active smokers | \(\alpha >0\) |

5 | \(\mu\) | The natural death rate over the population | \(0<\mu <1\) |

6 | \(\nu\) | The death rate of secondhand smoker because of being secondhand smoker | \(0\le \nu \le 1\) |

7 | \(\kappa\) | The death rate of smoker by smoking tobacco | \(0\le \kappa \le 1\) |

8 | \(\eta\) |
The death rate of quit because of smoking habit before joining the state Q
| \(0\le \eta \le 1\) |

9 | \(\sigma\) | The exit rate of secondhand smoker to the health people | \(0\le \sigma \le 1\) |

10 | \(\xi\) | The exit rate of people who have stopped smoking to the healthy population | \(0\le \xi \le 1\) |

11 | \(\lambda\) |
Infection rate from P to S
| \(0< \lambda \le 1\) |

12 | \(\zeta\) |
Exit rate from S to Q
| \(0\le \zeta \le 1\) |

13 | \(\delta\) |
Infection rate from Q to S
| \(0< \nu \le 1\) |