condition mean min max ZT0-3 9.701676666666666 8.852525 11.20285 ZT4-7 5.49603 5.49603 5.49603 ZT8-11 5.708905 5.708905 5.708905 ZT12-15 9.2776625 8.380455 10.17487 ZT16-19 9.09547 9.09547 9.09547 ZT20-23 11.350999999999999 11.350999999999999 11.350999999999999