Table 1 Fixed model parameters

Behavioural parameters

Population size (Female = 20,000, Male = 20,000)

40,000

-

Age range in years (uniform distribution)

16–44

Natsal 2000 [19]

Preferred number of concurrent partners

Natsal 2000 [19]

   <35 years old

1 or 2

   35+ years old

1

Proportion wanting 2 partners (< 35 years old)

0.05

Assumption based on Kretzschmar model [24]

Mean duration of short partnerships (days)

14

Assumption based on Natsal 2000 [19]

Number of sex acts per day

Assumption based on Kretzschmar model [24]

   Short partnerships

1

   Long partnerships

0.25

Mean gap in days between partnerships (dispersion)*

14 (2)

Assumption

Infection parameters

Duration (in days)

Assumption based on Golden [10], Korenromp [30]

   No treatment seeking

180

   Treatment seeking

30

Mean refractory period (in days) following treatment (dispersion)*

7 (10)

Assumption based on CEG guidelines [5]

Health care parameters

Attendance rate at health care setting (proportion who report attending a health care setting in the last 12 months)

0.85

Chlamydia Recall Study [26,27]

Treatment efficacy (in those partner notified or screened)

0.95

Treatment guidelines [37]

Mean delay (in days) before partner treatment (dispersion)*

7 (10)

Assumption based on unpublished Recall study

Probability of accepting screen

0.5

Assumption based on screening studies [38,39]