condition mean min max ZT0-3 6.2860724999999995 5.952344999999999 6.6198 ZT4-7 5.895289999999999 5.895289999999999 5.895289999999999 ZT8-11 6.695180000000001 6.695180000000001 6.695180000000001 ZT12-15 0 0 0 ZT16-19 7.587715 7.587715 7.587715 ZT20-23 5.627935000000001 5.627935000000001 5.627935000000001