condition mean min max ZT0-3 2414.147747 2414.147747 2414.147747 ZT4-7 2838.4639665 2838.4639665 2838.4639665 ZT8-11 3007.58681 3007.58681 3007.58681 ZT12-15 2841.600583 2841.600583 2841.600583 ZT16-19 3138.497956 3138.497956 3138.497956 ZT20-23 2498.6274785 2498.6274785 2498.6274785