condition mean min max ZT0-3 11.0293 11.0293 11.0293 ZT4-7 9.063815 9.063815 9.063815 ZT8-11 9.96106 9.96106 9.96106 ZT12-15 13.5579 13.5579 13.5579 ZT16-19 13.10435 13.10435 13.10435 ZT20-23 11.2529 11.2529 11.2529