Table 1. Basic descriptive statistics of the study participants, stratified by sex and age (Croatia, 2019).
| Study variables | Total sample (N = 1036) | Boys (N = 463) |
Girls (N = 573) |
p-value |
|---|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | ||
|
Waist circumference (cm) |
||||
| 1st grade | 72 (8) | 75 (8) | 70 (8) | |
| 2nd grade | 72 (9) | 77 (8) | 69 (8) | |
| 3rd grade | 74 (10) | 79 (11) | 69 (7) | |
| 4th grade | 75 (10) | 80 (10) | 70 (6) | <0.001 |
|
Sit-ups in 1 minute (x) |
||||
| 1st grade | 49 (12) | 55 (14) | 46 (10) | |
| 2nd grade | 52 (10) | 56 (9) | 48 (9) | |
| 3rd grade | 52 (12) | 56 (11) | 47 (11) | |
| 4th grade | 52 (13) | 57 (14) | 47 (11) | <0.001 |
|
Standing long jump (cm) |
||||
| 1st grade | 182 (29) | 205 (26) | 167 (19) | |
| 2nd grade | 183 (33) | 206 (32) | 167 (24) | |
| 3rd grade | 193 (35) | 215 (29) | 167 (21) | |
| 4th grade | 188 (33) | 211 (28) | 166 (21) | <0.001 |
|
Sit-and-reach test (cm) |
||||
| 1st grade | 66 (13) | 61 (10) | 70 (13) | |
| 2nd grade | 70 (14) | 64 (13) | 73 (13) | |
| 3rd grade | 66 (13) | 62 (11) | 72 (14) | |
| 4th grade | 65 (14) | 62 (14) | 69 (13) | <0.001 |
|
Perceived fitness* (1–10 scale) |
||||
| 1st grade | 7 (5–8) | 7 (6–9) | 6 (4–7) | |
| 2nd grade | 7 (5–8) | 7 (7–8) | 6 (5–8) | |
| 3rd grade | 7 (6–8) | 7 (6–8) | 6 (5–8) | |
| 4th grade | 7 (5–7) | 7 (6–8) | 6 (5–7) | <0.001 |
*median (25–75 percentile range)