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Table 3 Daily mouthing habits in children

From: Migration protocol to estimate metal exposure from mouthing copper and tin alloy objects

Age group (months) Estimated mean daily mouthing time for “other objects” (minute: second)
  Norris & Smith[22] Groot et al.*[23] Greene**[21] Juberg et al.[24]
1-3 05:14 09:00
3-6 12:29 03:00 22:30 09:00
6-9 24:30 09:00 22:30 09:00
9-12 16:25 09:00 22:30 09:00
12-15 12:02 07:00 21:00 09:00
15-18 23:01 07:00 21:00 09:00
18-21 19:49 02:00 21:00 02:00
21-24 12:53 02:00 21:00 02:00
24-36 21:46 02:00 18:42 02:00
36-48 15:16
48-60 10:44
60-72 10:00
  1. *Values were extracted from Figure 1 of Steenbekkers[25] where the original study data (Groot et al.[23]) was analyzed.
  2. **Reported values of minutes per hour were transformed to daily mouthing time, multiplying the hour based time by the number of hours awaken of the children in each age group: 3–12 month - 9 hours awake, 12–24 month - 10 hours awake, and 24–36 month - 11 hours awake (taken from Norris B. & S. Smith,[22]).