1965–66	1975–76	1985	1992–94	2003
Harmonized activity categories in the AHTUS
−8	Item missing	×	×	×	×	×
1	General or other personal care	×	×	×	×	×
2	Imputed personal or household care	×	×	×	×	×
3	Sleep	×	×	×	×	×
4	Imputed sleep	×	×	×	×	×
5	Naps and rest	×	×	×	NO	×
6	Wash, dress, personal care	×	×	×	×	×
7	Personal medical care	×	×	×	×	×
8	Meals at work	×	×	×	NO	×
9	Other meals & snacks	×	×	×	×	×
10	Main paid work (not at home)	×	×	×	×	×
11	Paid work at home	×	×	×	×	×
12	Second job, other paid work	×	×	×	×	×
13	Work breaks	×	×	×	×	×
14	Other time at workplace	×	×	×	NO	×
15	Time looking for work	NO	×	×	×	×
16	Regular schooling, education	×	×	×	×	×
17	Homework	×	×	×	×	×
18	Short course or training	×	×	×	×	×
19	Occasional or other education/training	×	×	×	×	×
20	Food preparation, cooking	×	×	×	×	×
21	Set table, wash/put away dishes	×	×	×	×	×
22	Cleaning	×	×	×	×	×
23	Laundry, ironing, clothing repair	×	×	×	×	×
24	Home repairs, maintain vehicle	×	×	×	×	×
25	Other domestic work	×	×	×	×	×
26	Purchase routine goods	×	×	×	×	×
27	Purchase consumer durables	×	×	×	×	×
28	Purchase personal services	×	×	×	×	×
29	Purchase medical services	×	×	×	×	×
30	Purchase repair, laundry services	×	×	×	×	×
31	Financial/government services	×	×	×	×	×
32	Purchase other services	×	×	×	×	×
33	Care of infants	×	×	×	×	×
34	General care of older children	×	×	×	×	×
35	Medical care of children	×	×	×	×	×
36	Play with children	×	×	×	×	×
37	Supervise child or help with	×	×	×	×	×
38	Homework	×	×	×	×	×
39	Read to, talk with child	×	×	×	×	×
40	Adult care	×	×	×	×	×
41	General voluntary acts	×	×	×	×	×
42	Political and civic activity	×	×	×	×	×
43	Union and professional activities	NO	×	×	×	NO
44	Volunteer child/family organization	NO	×	×	×	NO
45	Volunteer fraternal organization	NO	×	×	×	NO
46	Other formal volunteering	×	×	×	×	NO
48	Acts for religious organization	×	×	×	×	NO
49	Worship and religious acts	×	×	×	×	×
50	General out-of-home leisure	×	×	×	NO	×
51	Attend sporting event	×	×	×	×	×
52	Go to cinema	×	×	×	×	×
53	Theater, concert, opera	×	×	×	×	×
54	Museums, exhibitions	×	×	×	×	×
55	Attend other public event	×	×	×	×	NO
56	Restaurant, cafe bar	×	×	×	×	×
57	Parties or receptions	×	×	×	×	×
58	Imputed time away from home	×	×	×	×	×
60	Sports & exercise	×	×	×	×	×
62	Walking	×	×	×	×	×
63	Cycling	NO	×	×	×	×
64	Outdoor recreation	NO	×	×	×	×
65	Physical activity, sports with child	×	×	×	×	×
66	Hunting, fishing, boating, hiking	×	×	×	NO	×
67	Gardening	×	×	×	×	×
68	Pet care, walk dogs	×	×	×	×	×
70	General indoor leisure	×	×	×	×	×
71	Imputed in-home social	×	×	×	×	×
72	Receive or visit friends	×	×	×	×	×
73	Other in-home social, games	×	×	×	×	×
74	Play musical instrument, sing, act	×	×	×	×	NO
75	Artistic activity	×	×	×	×	×
76	Crafts	×	×	×	×	×
77	Hobbies	×	×	×	×	×
78	Relax, think, do nothing	×	×	×	×	×
81	Read books	×	×	×	×	×
82	Read periodicals	×	×	×	×	NO
83	Read newspapers	×	×	×	×	NO
84	Listen to music (CD etc.)	×	×	×	×	×
85	Listen to radio	×	×	×	×	×
86	Watch television, video	×	×	×	×	×
87	Writing by hand	×	×	×	×	×
88	Conversation, phone, texting	×	×	×	×	×
89	Use computer	NO	NO	×	×	×
90	Imputed travel	×	×	×	×	×
91	Personal or adult care travel	×	×	×	×	×
92	Travel as part of paid work	NO	NO	NO	×	×
93	Travel to/from work + other work travel	×	×	×	×	×
94	Travel related to education	×	×	×	×	×
95	Travel related to consumption	×	×	×	×	×
96	Travel related to child care	×	×	×	×	×
97	Travel for volunteering or worship	×	×	×	×	×
98	Other travel	×	×	×	×	×
Location variables and category codes in the AHTUS
INOUT – outside, inside or in vehicle
−8	Location unknown	×	×	×	×	×
1	Outside	×	×	×	×	×
2	Inside	×	×	×	×	×
3	In a vehicle	×	×	×	×	×
ELOC – location, includes implied from activity codes as well as diary columns
−8	Location unknown	×	×	×	no	×
1	Own home	×	×	×	×	×
2	Other home	×	×	×	×	×
3	Workplace	×	×	×	×	×
4	School	×	×	×	×	×
5	Services or shops	×	×	×	×	×
6	Restaurant, café, bar	×	×	×	×	×
7	Place of worship	×	×	×	×	×
8	Traveling	×	×	×	×	×
9	Other	×	×	×	×	×
MTRAV – mode of travel
−8	Not answered	Not present	Not present	×	×	No
−7	Not traveling			×	×	×
1	Car, truck, motorcycle			×	×	×
2	Public, mass transport			×	×	×
3	Walk (including child carried)			×	×	×
4	Cycle			Limited	×	×
5	Other or unspecified mode			×	×	×