Table 2 Model inputs

X0

Arrivals. The number of women who attend the clinic.

- No default value, it ranges from 2 to 20.

Also a Key Performance Indicator (KPI), see next section.

X1

Arrivals pattern

- “All”^a. All the women arrive at 08:00

- “Half”. Half of the women arrive at 08:00 and half at 08:30

For odd numbers of arrivals the larger value arrives at 08:00.

X2

Order of midwife and doctor consultation

- “Doc” a woman can see a doctor first if one is available, before seeing a midwife

- “Mid”^a the woman sees a midwife before a doctor.

X3

Number of midwives

Two^a or three.

X4

Number of doctors

Two^a or three.

X5

Number of CTGs

Three^a or four.