condition mean min max ZT0-3 6.90751 6.90751 6.90751 ZT4-7 5.059365 5.059365 5.059365 ZT8-11 5.366445000000001 5.366445000000001 5.366445000000001 ZT12-15 6.2699 6.2699 6.2699 ZT16-19 8.03114 8.03114 8.03114 ZT20-23 6.342625 6.342625 6.342625