condition mean min max ZT0-3 29.620725 28.452849999999998 30.788600000000002 ZT4-7 28.4358 28.4358 28.4358 ZT8-11 26.207349999999998 26.207349999999998 26.207349999999998 ZT12-15 0 0 0 ZT16-19 25.29995 25.29995 25.29995 ZT20-23 27.00225 27.00225 27.00225