condition mean min max ZT0-3 10.123537500000001 7.393775 12.8533 ZT4-7 12.187249999999999 12.187249999999999 12.187249999999999 ZT8-11 13.4092 13.4092 13.4092 ZT12-15 0 0 0 ZT16-19 16.9287 16.9287 16.9287 ZT20-23 12.5556 12.5556 12.5556