longitudinal study wave marker
0 = not longitudinal study/case
1 = Wave 1
2 = Wave 2
3 = Wave 3
4 = Wave 4

multiple samples in study
0 = 1 sample
1 = Szalai USA 65 sample
2 = national USA 65 sample
3 = USA 1998-99
4 = USA 2000-01
5 = Slovenia in Szalai Yugoslavia
6 = Serbia in Szalai Yugoslavia
7 = UK 1987 - main sample, drawn from SCELI survey
8 = UK 1987 - spouses and additional household members
9 = East Germany
10 = West Germany
11 = Basque Country in Spain
12 = Catalan Country in Spain
13 = UK 1983-84 one week
14 = UK 1983-84 one day

Household identifier
0 = 1 person sampled per household

Day of week diary kept
-9 = could not be created
-8 = Missing
1 = Sunday
2 = Monday
3 = Tuesday
4 = Wednesday
5 = Thursday
6 = Friday
7 = Saturday
8 = Whole week average
9 = Unspecified weekday
10 = Unspecified weekend day

calendar day diary kept
-9 = could not be created
-8 = Missing

Month diary kept
-9 = could not be created
-8 = Missing
1 = January
2 = February
3 = March
4 = April
5 = May
6 = June
7 = July
8 = August
9 = September
10 = October
11 = November
12 = December

Diary order
-9 = could not be created
-8 = Missing
1 = 1st diary day
2 = 2nd diary day
3 = 3rd diary day
4 = 4th diary day
5 = 5th diary day
6 = 6th diary day
7 = 7th diary day
8 = Weekly average

marker of insufficient information to make propwt
0 = diary case has a weight
1 = insufficient information to create weight: propwt=0

-8 = missing
1 = Man
2 = Woman

-8 = missing
-7 = not asked
90 = 90 or older

main act, 69 category list
10 = unpaid work to generate household income
22 = maintain home/vehicle, including collect fuel
62 = no second act, imputed or recorded transport

secondary act, 69 category list
-7 = no second act collected from diary group
10 = unpaid work to generate household income
22 = maintain home/vehicle, including collect fuel
62 = no second act, imputed or recorded transport

inside or outside
-9 = location not collected by study
-8 = location unknown
-7 = location not collected from diary group
1 = inside
2 = outside
3 = in a vehicle

location
-9 = location not collected by study
-8 = location unknown
-7 = location not collected from diary group
1 = at own home
2 = at another’s home
3 = at workplace
4 = at school
5 = at services or shops
6 = at restaurant, bar, cafe
7 = at place of worship
8 = travelling
9 = other locations

used internet or ict during activity
-9 = could not be created for study
-7 = not collected for diary group
0 = no
1 = yes

mode of transport
-9 = mode not collected by study
-8 = missing
-7 = not travelling
1 = travel by car, van
2 = public transport
3 = walk / on foot
4 = other physical transport
5 = other/unspecified transport