Table 1.

Age and abstinence period by numbers of weeks between consecutive samples.

Weeks between samples	No. of samples	Median abstinence period, days (IQR)	Median age, years (IQR)
1	19	3.9 (3.0–4.0)	42.0 (38.0–52.0)
2	47	3.5 (2.5–4.0)	38.0 (34.0–45.0)
3	57	4.0 (3.5–5.0)	36.0 (33.5–41.0)
4	203	3.5 (3.0–4.5)	36.0 (32.0–41.0)
5	270	3.5 (3.0–4.0)	37.0 (33.0–41.0)
6	133	3.0 (2.5–3.5)	36.0 (33.0–39.5)
7	90	3.0 (2.5–3.0)	39.0 (34.0–45.0)
8	77	3.0 (2.5–3.5)	36.0 (33.0–40.0)
9	48	2.9 (2.5–3.0)	35.0 (32.0–39.0)
10	41	3.0 (2.5–3.3)	38.0 (35.0–43.0)
11	43	2.8 (2.3–3.0)	37.0 (34.0–40.0)
12	23	3.0 (2.5–3.8)	37.0 (33.0–41.0)
13	24	3.0 (2.5–3.5)	35.0 (32.0–39.0)

Note: IQR = interquartile range.