condition mean min max ZT0-3 8.952115 8.952115 8.952115 ZT4-7 9.775006000000001 9.775006000000001 9.775006000000001 ZT8-11 9.090687500000001 9.090687500000001 9.090687500000001 ZT12-15 8.3126355 8.3126355 8.3126355 ZT16-19 9.214923500000001 9.214923500000001 9.214923500000001 ZT20-23 9.966190000000001 9.966190000000001 9.966190000000001