condition mean min max ZT0-3 16.798957 16.798957 16.798957 ZT4-7 19.598135499999998 19.598135499999998 19.598135499999998 ZT8-11 14.853172 14.853172 14.853172 ZT12-15 20.531181 20.531181 20.531181 ZT16-19 19.546644 19.546644 19.546644 ZT20-23 19.509078000000002 19.509078000000002 19.509078000000002