condition mean min max ZT0-3 28.687373 28.687373 28.687373 ZT4-7 22.964057500000003 22.964057500000003 22.964057500000003 ZT8-11 14.32815 14.32815 14.32815 ZT12-15 9.5656045 9.5656045 9.5656045 ZT16-19 9.756152 9.756152 9.756152 ZT20-23 10.16662 10.16662 10.16662