condition mean min max ZT0-3 10.829067 10.829067 10.829067 ZT4-7 10.60792 10.60792 10.60792 ZT8-11 12.620662 12.620662 12.620662 ZT12-15 12.4371325 12.4371325 12.4371325 ZT16-19 11.9781115 11.9781115 11.9781115 ZT20-23 10.4636025 10.4636025 10.4636025