SELECT 
				SUM( CASE WHEN (`roster_members`.`character_level` >= 0 AND `roster_members`.`character_level` <= 10)THEN 1 ELSE 0 END) as lvl10,
				SUM(CASE WHEN (`roster_members`.`character_level` >= 11 AND `roster_members`.`character_level` <= 20) THEN 1 ELSE 0 END) as lvl20, 
				SUM(CASE WHEN `roster_members`.`character_level` >= 21 AND `roster_members`.`character_level` <= 30 THEN 1 ELSE 0 END) as lvl30, 
				SUM(CASE WHEN `roster_members`.`character_level` >= 31 AND `roster_members`.`character_level` <= 40 THEN 1 ELSE 0 END) as lvl40, 
				SUM(CASE WHEN `roster_members`.`character_level` >= 41 AND `roster_members`.`character_level` <= 50 THEN 1 ELSE 0 END) as lvl50,
				SUM(CASE WHEN `roster_members`.`character_level` >= 51 AND `roster_members`.`character_level` <= 60 THEN 1 ELSE 0 END) as lvl59,
				SUM(CASE WHEN `roster_members`.`character_level` >= 61 AND `roster_members`.`character_level` <= 69 THEN 1 ELSE 0 END) as lvl69,
				SUM(CASE WHEN `roster_members`.`character_level` = 70 THEN 1 ELSE 0 END) as lvl70 
				FROM `roster_members`  ORDER BY `roster_members`.`character_level` ASC

⇄lvl10 => string (2) "11"

$row['lvl10']

⇄lvl20 => string (2) "29"

$row['lvl20']

⇄lvl30 => string (2) "31"

$row['lvl30']

⇄lvl40 => string (2) "17"

$row['lvl40']

⇄lvl50 => string (2) "44"

$row['lvl50']

⇄lvl59 => string (3) "128"

$row['lvl59']

⇄lvl69 => string (2) "76"

$row['lvl69']

⇄lvl70 => string (3) "434"

$row['lvl70']