condition mean min max ZT0-3 34.125799 34.125799 34.125799 ZT4-7 27.334251000000002 27.334251000000002 27.334251000000002 ZT8-11 26.831395999999998 26.831395999999998 26.831395999999998 ZT12-15 21.9113495 21.9113495 21.9113495 ZT16-19 13.489376 13.489376 13.489376 ZT20-23 16.01334 16.01334 16.01334