condition mean min max ZT0-3 16.20725 16.20725 16.20725 ZT4-7 11.9032 11.9032 11.9032 ZT8-11 13.138850000000001 13.138850000000001 13.138850000000001 ZT12-15 13.81635 13.81635 13.81635 ZT16-19 19.104550000000003 19.104550000000003 19.104550000000003 ZT20-23 15.99655 15.99655 15.99655