condition mean min max ZT0-3 389.540955 389.540955 389.540955 ZT4-7 281.3103235 281.3103235 281.3103235 ZT8-11 481.63925000000006 481.63925000000006 481.63925000000006 ZT12-15 557.5272175 557.5272175 557.5272175 ZT16-19 485.815749 485.815749 485.815749 ZT20-23 409.30735849999996 409.30735849999996 409.30735849999996