condition mean min max ZT0-3 16.164099999999998 11.4955 20.8327 ZT4-7 32.076350000000005 32.076350000000005 32.076350000000005 ZT8-11 4.55382 4.55382 4.55382 ZT12-15 0 0 0 ZT16-19 2.1155535 2.1155535 2.1155535 ZT20-23 17.84475 17.84475 17.84475