condition mean min max ZT0-3 11.702451 11.702451 11.702451 ZT4-7 15.147088 15.147088 15.147088 ZT8-11 13.103421 13.103421 13.103421 ZT12-15 10.946017000000001 10.946017000000001 10.946017000000001 ZT16-19 11.162777 11.162777 11.162777 ZT20-23 12.523151 12.523151 12.523151