condition mean min max ZT0-3 10.96515 10.96515 10.96515 ZT4-7 5.002015 5.002015 5.002015 ZT8-11 8.7605 8.7605 8.7605 ZT12-15 24.83935 24.83935 24.83935 ZT16-19 23.498350000000002 23.498350000000002 23.498350000000002 ZT20-23 16.16815 16.16815 16.16815