condition mean min max ZT0-3 1.3912904999999998 1.1661409999999999 1.6164399999999999 ZT4-7 3.580545 3.580545 3.580545 ZT8-11 1.0773190000000001 1.0773190000000001 1.0773190000000001 ZT12-15 0 0 0 ZT16-19 0.5298705 0.5298705 0.5298705 ZT20-23 2.02241 2.02241 2.02241