Table 1 Variable selection for the Cox proportional model

Time variable

Time

Survival time, number of years a community receives the repatriated landraces to the last year where farmers plant these varieties (time to abandonment)

4.29 (4.38)

NAs = 43

Event/status variable

Event

Dummy variable (1 = abandonment of repatriated landraces has happened, 0 = otherwise)

0 (n = 96)

1 (n = 172)

NAs = 33

Covariates/ Independent variables

Gender

Binary gender (male or female) of the person managing the plots with repatriated potatoes

Male (n = 246)

Female (n = 49)

NAs = 6

Age

Age group of the person managing the plots with repatriated potatoes (below 30 = plot manager is below 30 years of age,

30–60 = plot manager is between 30 and 60 years,

60 +  = plot manager is older than 60)

Below 30 (n = 20)

30–60 (n = 205)

60 + (n = 65)

NAs = 11

Education

Education of the person managing the plots with repatriated potatoes (none = 0, initial = 1, primary = 2, secondary = 3, technical = 4, tertiary = 5, other = 6)

0 (n = 14)

2 (n = 174)

3 (n = 84)

4 (n = 6)

5 (n = 11)

NAs = 12

Labor force

Number of internal (household members) and external people who help with agricultural work

8.84 (5.16)

NAs = 12

Wealth

Number of services (drinking water, drainage, electricity, telephone, TV, internet) per household

2.63 (1.33)

NAs = 11

Food insecurity

Index of Peruvian food insecurity in the face of recurrent natural disasters. Average per district (index running from 0.00 (= no risk of food insecurity) to 0.85 (= very high risk of food insecurity)^a

0.36 (0.22)

NAs = 4

Zone

Geographical zone in Peru: Center includes the departments Ancash, Huánuco, Pasco, Lima, Junín, Huancavelica; South includes Ayacucho, Apurímac, Cusco, Arequipa, Puno^b

Center (n = 123)

South (n = 178)