condition mean min max ZT0-3 23.977400000000003 19.1889 28.765900000000002 ZT4-7 11.3287 11.3287 11.3287 ZT8-11 8.52435 8.52435 8.52435 ZT12-15 0 0 0 ZT16-19 16.20785 16.20785 16.20785 ZT20-23 19.376800000000003 19.376800000000003 19.376800000000003