Table 3. Demographic characteristics of participants in study of antibodies against Cryptosporidium in drinking water, Scotland, UK, 2006–2008*.

Characteristic	Location, water filtration status
	Dundee		Glasgow
	Before	After	Before	After
Mean age, y	42.3 (40.8–43.9)	45.5 (43.8–47.2)	38.8 (37.9–39.6)	42.7 (41.7–43.6)
Female, %	44.2 (38.3–50.3)	45.2 (38.7–52)	47.1 (43.9–50.3)	43.1 (39.6–46.8)
Swam in past 12 mo, %	64.6 (58.6–70.2)†	48.3 (41.6–55.1)‡	58.4 (55.1–61.5)†	50.1 (46.4–53.7)‡
Have with <5 children, %	8.5 (5.7–12.5)†	9.5 (6.2–14.3)‡	7.4 (5.9–9.2)†	7.5 (5.8–9.7)‡
Have pets, %	43.8 (37.9–49.9)†	38.8 (32.4–45.5)‡	32.3 (29.3–35.4)†	30.8 (27.5–34.3)‡
Drink unboiled water, %	96.2 (93.1–97.9)†	95.2 (91.4–97.4)‡	89.2 (87.1–91.1)†	88.4 (85.8–90.5)‡
Drink bottled water, %	69.2 (63.4–74.5)1	63.2 (56.4–69.4) ‡	77.4 (74.6–80)†	73.7 (70.3–76.8)‡

*Before, before filtration in Glasgow (periods 1 and 2); after, after filtration in Glasgow (periods 3 and 4).
†Percentage of persons who answered “yes” to the question at period 1, period 2, or both.
‡Percentage of persons who answered “yes” to the question at period 3, period 4, or both.