Getting ahead or falling behind: Findings from the second wave of the National Income Dynamics Study

Figures & data

Table 1: Wave 1 household responses

	Number	Percent
Total dwelling units sampled	10 367
Plus multi-households added to sample	491
Total potential sample	10 858	100
Less vacant and out-of-scope dwelling units	523	5
Less no-access areas	119	1
Less non-contacts	1 214	11
Less refusals	1 698	16
Participating households (as % potential sample)	7 301	67
Participating households (as % potential sample less vacant and out of scope)	7 301	71

Table 2: Wave 1 individual responses

	Number	Percent
Household members	31 163
Less non-resident members	2 916
Continuing sample members	28 247	100
Adult questionnaire	15 633	55
Proxy questionnaire	1 753	6
Child questionnaire	9 408	33
Individuals refusal or unavailability	1 453	5

Table 3: Wave 1 and Wave 2 individual outcomes

	Wave 2
Wave 1	Success	Refused/not available	Household non-response	Moved outside South Africa	Dead	Total
Success	21 098	520	4 279	51	846	26 794
Refused/not available	952	91	365	2	43	1 453
Not in Wave 1	6 591	209	23	0	140	6 963

Table 4: Reasons for household non-response at the individual level

	Number	Percent
Refused/not available	1 814	38.9
Not located	2 224	47.7
Not tracked	629	13.5
Total	4 667	100.0

Table 5: Reasons for attrition

Reason	Number	Percent
Refusal	2 136	37.5
Non-contact	2 714	47.7
Deceased	846	14.9
Total	5 696	100.0

Table 6: Attrition by Wave 1 income decile

Decile	Number of refusals	Number of non-contacts	Number of deceased	Total number of individuals	Attrition rate (%)
1	125	322	67	514	18.6
2	124	266	78	468	17.2
3	79	228	81	388	14.4
4	158	230	70	458	17.0
5	122	212	93	427	16.1
6	148	251	116	515	19.1
7	174	260	91	525	19.8
8	191	271	122	584	22.1
9	310	327	77	714	27.3
10	705	347	51	1103	41.6
Total	2 136	2714	846	5696	21.3

Table 7: Attrition by racial group

Population group	Refusal	Non-contact	Deceased	Total	Attrition rate (%)
African	1 054	2 067	710	3 831	18.1
Coloured	480	427	100	1 007	26.1
Asian/Indian	112	30	8	150	39.5
White	490	190	28	708	53.1
Total	2 136	2 714	846	5 696	21.3