condition mean min max ZT0-3 33.1031 29.590200000000003 36.616 ZT4-7 25.470100000000002 25.470100000000002 25.470100000000002 ZT8-11 18.593850000000003 18.593850000000003 18.593850000000003 ZT12-15 0 0 0 ZT16-19 24.0476 24.0476 24.0476 ZT20-23 30.3275 30.3275 30.3275