rule of thumb or words of wisdon for btree cleaners?

Does anyone have a rule of thumb or words of wisdom regarding additonal btree cleaners? Looking at the output below it seems I could benefit from adding an additional cleaner or more. Stats reset at 8:30 AM or 6 hrs ago. HPUX 11 $ onstat -C IBM Informix Dynamic Server Version 9.40.FC2W4 -- On-Line -- Up 4 days 14:58:57 -- 4460564 Kbytes Btree Cleaner Info BT scanner profile Information ============================== Active Threads 1 Global Commands 0 Number of partition scans 34 Main Block 0xc0000000e0a97cc8 BTC Admin 0x0000000000000000 BTS info id Prio Partnum Key Cmd 0xc0000000e0eb58b0 0 Low 0x0600003D 1 100000 Scan index Number of leaves pages scanned 10803470 Number of leaves with deleted items 68590 Time spent cleaning (sec) 22302 Number of index compresses 11354 Number of deleted items 1269652 Number of index range scans 0 Number of index leaf scans 509 Scan Type Leaf