Table 2 Incidence rates (IR) and 95% confidence intervals (CI) per 1000 person-month follow-up of discontinuation among those who reported taking part in the activity in grade 6.

From: Puberty timing and relative age as predictors of physical activity discontinuation during adolescence

	Girls				Boys
	Participants taking part (n)	Person-months follow-up (n)	Discontinued (n)	IR^a (95% CI)	Participants taking part (n)	Person-months follow-up (n)	Discontinued (n)	IR^a (95% CI)
Context
Organized	365	14,567	122	8 (7–10)	290	11,084	94	8 (7–10)
Unorganized	425	17,571	124	7 (6–8)	336	14,532	56	4 (3–5)
Format
Group	399	15,092	151	10 (9–12)	307	11,067	104	9 (8–11)
Individual	427	18,129	108	6 (5–7)	334	14,458	64	4 (3–6)
Type
Cross-country skiing	39	564	29	51 (36–74)	31	445	27	61 (42–88)
Aerobics, yoga, exercise class	89	1129	60	53 (41–68)	33	430	28	65 (45–94)
Badminton	98	1432	71	50 (39–63)	108	2041	81	40 (32–49)
Ball games (dodge ball, kickball, catch)	149	1950	110	56 (47–68)	143	2437	107	44 (36–53)
Baseball	66	1318	45	34 (25–46)	70	1337	51	38 (29–50)
Basketball	110	2191	65	30 (23–46)	137	2704	89	33 (27–41)
Bicycling	272	5962	192	32 (28–37)	265	8034	136	17 (14–20)
Boxing,wrestling	26	426	17	40 (25–64)	54	956	37	39 (28–53)
Dance	239	6512	132	20 (17–24)	28	345	22	64 (42–97)
Downhill skiing	58	1004	40	40 (29–54)	68	1253	45	36 (27–48)
Canadian football	22	209	18	86 (54–137)	91	1691	61	36 (28–46)
Games (chase, tag, hide and seek)	246	4020	181	45 (39–52)	176	2886	137	47 (40–56)
Golf	23	386	17	44 (27–71)	40	797	24	30 (20–45)
Gymnastics	115	2291	75	33 (26–41)	24	258	22	85 (56–130)
Handball	64	738	54	73 (56–96)	53	677	46	68 (51–91)
Home exercises (push-ups, sit-ups)	212	5229	119	23 (19–27)	185	5734	93	16 (13–20)
Ice Skating	104	1734	78	45 (39–52)	81	1187	70	59 (47–75)
Ice Hockey	36	932	19	20 (13–32)	133	5308	34	6 (5–9)
Jogging/running	242	5535	139	25 (21–30)	190	5366	112	21 (17–25)
Karate	28	419	18	43 (27–68)	61	1307	35	27 (19–37)
Canoe, Kayak	28	294	21	71 (47–110)	22	388	19	49 (31–77)
In-line skating	55	708	43	61 (45–82)	34	568	30	53 (37–76)
Ringette	54	1807	27	15 (10–22)	12	115	11	96 (53–173)
Skateboarding	44	727	30	41 (29–59)	83	1891	58	31 (24–40)
Street/floor hockey	48	1015	32	32 (22–45)	159	4265	97	23 (19–28)
Skip rope	132	1441	107	74 (61–90)	31	456	26	57 (39–84)
Soccer	184	4261	116	27 (23–33)	184	4714	111	24 (20–28)
Swimming	185	3769	117	31 (26–37)	106	2069	73	35 (28–44)
Tennis	30	380	24	63 (42–94)	50	1045	37	35 (26–49)
Track and field	72	1103	58	53 (41–68)	79	1266	66	52 (41–66)
Trampoline	225	4862	165	34 (29–40)	137	2587	100	39 (32–47)
Volleyball	137	3602	95	26 (22–32)	49	1358	31	23 (16–32)
Weight training	42	668	34	51 (36–71)	102	2880	53	18 (14–24)

Discontinuation was considered to have occurred when an individual had a one year or more interruption in meeting the definition of participating in organized, unorganized, individual, or group-based activities.
^aIncidence Rate (IR) per 1000 person-month follow-up.

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Table 2 Incidence rates (IR) and 95% confidence intervals (CI) per 1000 person-month follow-up of discontinuation among those who reported taking part in the activity in grade 6.

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