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Table 2 Age at which children were first introduced to an indoor heated swimming pool

From: Physical activities of Patients with adolescent idiopathic scoliosis (AIS): preliminary longitudinal case–control study historical evaluation of possible risk factors

Age regular swimming/attending pool

AIS patients

Controls

Controls with VSPA

Controls without VSPA

Number (%)

Number (%)

Number (%)

Number (%)

1st year

46 (58.2)

24 (31.2)

16 (64.0)

8 (15.4)

2nd year

6 (7.6)

9 (11.7)

1 (4.0)

8 (15.4)

3rd year

4 (5.1)

3 (3.9)

2 (8.0)

1 (1.9)

4th year

4 (5.1)

5 (6.5)

2 (8.0)

3 (5.8)

5th year

7 (8.9)

7 (9.1)

1 (4.0)

6 (11.5)

6th year

2 (2.5)

14 (18.2)

3 (12.0)

11 (21.2)

7th year or later

7 (8.9)

15 (19.5)

0 (0.0)

15 (28.8)

Never in pool

3 (3.8)

0 (0.0)

0 (0.0)

0 (0.0)

Can swim by age 10 years

44 (55.7)

43 (55.8)

19 (76.0)

24 (46.2)