condition mean min max ZT0-3 0.68617975 0.47211000000000003 0.9002494999999999 ZT4-7 0.3164965 0.3164965 0.3164965 ZT8-11 0.2154425 0.2154425 0.2154425 ZT12-15 0 0 0 ZT16-19 0.36417099999999997 0.36417099999999997 0.36417099999999997 ZT20-23 0.3656565 0.3656565 0.3656565